[SOLVED] installed new kernel, network gone!

hooly · Post by **hooly** » Sat May 26, 2018 9:58 am

i recently heard that KDE/Plasma won't be available on Mint so i thought i'd consider making the switch from Mint 17.x with KDE to 18.3 with Cinnamon. installed 18.3, have been dual-booting between the two.
things have been going well, decided to stick with Cinnamon.
i (rashly) decided to apply all the updates available in the Update Manager which included kernel 4.13.0-43. the updates were applied without errors (that i'm aware of).
when i rebooted 18.3 I couldn't access the internet: emails dead, browsers reporting no web access, etc.
i'm relatively linux illiterate so i'm pretty much stuck and desperately looking for help.

i understand from poking around the forums that the following might be helpful:

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$ inxi -Fz
System:    Host: cinna18-box Kernel: 4.13.0-43-generic x86_64 (64 bit) Desktop: Cinnamon 3.6.7
           Distro: Linux Mint 18.3 Sylvia
Machine:   Mobo: ASRock model: Z97 Extreme6 Bios: American Megatrends v: P2.50 date: 10/06/2015
CPU:       Quad core Intel Core i7-4790 (-HT-MCP-) cache: 8192 KB 
           clock speeds: max: 4000 MHz 1: 1299 MHz 2: 1299 MHz 3: 1299 MHz 4: 1299 MHz 5: 1300 MHz 6: 1300 MHz
           7: 1405 MHz 8: 1313 MHz
Graphics:  Card: NVIDIA GM204 [GeForce GTX 970]
           Display Server: X.Org 1.18.4 drivers: nvidia (unloaded: fbdev,vesa,nouveau)
           Resolution: 1920x1080@60.00hz
           GLX Renderer: GeForce GTX 970/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 384.111
Audio:     Card-1 NVIDIA GM204 High Definition Audio Controller driver: snd_hda_intel
           Card-2 Intel 9 Series Family HD Audio Controller driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.13.0-43-generic
Network:   Card-1: Intel Ethernet Connection (2) I218-V driver: e1000e
           IF: enp0s25 state: up speed: 1000 Mbps duplex: full mac: <filter>
           Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
           IF: enp3s0 state: down mac: <filter>
Drives:    HDD Total Size: 4512.9GB (2.0% used) ID-1: /dev/sda model: Samsung_SSD_850 size: 512.1GB
           ID-2: /dev/sdb model: ST4000DM000 size: 4000.8GB
Partition: ID-1: / size: 344G used: 25G (8%) fs: ext4 dev: /dev/sda3
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 30.0C mobo: N/A gpu: 41C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 268 Uptime: 3 min Memory: 771.3/15986.6MB Client: Shell (bash) inxi: 2.2.35

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$ sudo lshw -C network
[sudo] password for cinna18: 
  *-network               
       description: Ethernet interface
       product: Ethernet Connection (2) I218-V
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: enp0s25
       version: 00
       serial: d0:50:99:29:67:00
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.1-4 ip=192.168.0.2 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:42 memory:ef500000-ef51ffff memory:ef538000-ef538fff ioport:f040(size=32)
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: enp3s0
       version: 11
       serial: d0:50:99:29:67:01
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:39 ioport:d000(size=256) memory:ef400000-ef400fff memory:e2100000-e2103fff

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$ rfkill list
$

needless to say i'd appreciate any guidance offered.

deepakdeshp · Post by **deepakdeshp** » Sat May 26, 2018 10:22 am

You can boot into the old kernel by choosing 2nd option advanced in grub menu. Here all the installed grubs will be displayed and you can boot with any of them

hooly · Post by **hooly** » Sat May 26, 2018 10:37 am

yeah, tried that, doesn't work for me.
the boot process on the alt kernel gets part way through, hangs for a while, and then dumps me to a "(infrms)" prompt (or something like that).
clearly that means there are other problems afoot but i figured i could tackle those in due course.

JerryF · Post by **JerryF** » Sat May 26, 2018 11:04 am

Have you tried manually installing an older kernel from the Update Manager and then starting Mint from Grub Advanced?

Try a kernel from the 4.4 series.

Post by **JeremyB** » Sat May 26, 2018 11:08 am

It might be a DNS/DHCP issue, can you ping anything?

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ping -c3 8.8.8.8

Or able to ping the router? ping -c3 192.168.0.1[/code]

hooly · Post by **hooly** » Sat May 26, 2018 11:49 am

JeremyB wrote: ⤴Sat May 26, 2018 11:08 am It might be a DNS/DHCP issue, can you ping anything? ...

thank you for the suggestions. here's the results of those pings:

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$ ping -c3 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=57 time=21.8 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=57 time=29.9 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=57 time=28.8 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 21.833/26.901/29.997/3.615 ms

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$ ping -c3 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.654 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.609 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.582 ms

--- 192.168.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2010ms
rtt min/avg/max/mdev = 0.582/0.615/0.654/0.029 ms

@ JerryF : thank you as well. didn't know older kernels were available offline via the Update Manager. if diagnosis/repair of the problem within the current kernel doesn't work i'll certainly try this option.

Schultz · Post by **Schultz** » Sat May 26, 2018 2:01 pm

hooly wrote:
didn't know older kernels were available offline via the Update Manager

It's not available offline. The Update Manager has to download the kernel(s).

hooly · Post by **hooly** » Sat May 26, 2018 2:18 pm

Schultz wrote: ⤴Sat May 26, 2018 2:01 pm It's not available offline. The Update Manager has to download the kernel(s).

mightn't that be a little challenging given the lack of internet connection?

jimallyn · Post by **jimallyn** » Sat May 26, 2018 2:23 pm

hooly wrote: ⤴Sat May 26, 2018 11:49 am didn't know older kernels were available offline via the Update Manager.

They aren't. But installing a new kernel doesn't uninstall your old kernel. So all you have to do is boot to your old kernel, and remove the new kernel that isn't working for you.

AZgl1800 · Post by **AZgl1800** » Sat May 26, 2018 2:37 pm

I can vouch for unsupported WiFi drivers that will disappear with a new kernel,
but I found out thru this forum, that if they are installed correctly, with their PPA, that they can be permanent and will survive a new kernel upgrade.

Post by **JeremyB** » Sat May 26, 2018 2:48 pm

You should go into Network Setting for the wired connection, IPv4 tab and add 8.8.8.8 as a DNS server

hooly · Post by **hooly** » Sat May 26, 2018 5:22 pm

JeremyB wrote: ⤴Sat May 26, 2018 2:48 pm You should go into Network Setting for the wired connection, IPv4 tab and add 8.8.8.8 as a DNS server

have done this now, can't say it made a lot of difference. anything obvious i should be looking for?

hooly · Post by **hooly** » Sat May 26, 2018 5:24 pm

jimallyn wrote: ⤴Sat May 26, 2018 2:23 pm
hooly wrote: ⤴Sat May 26, 2018 11:49 am didn't know older kernels were available offline via the Update Manager.
They aren't. But installing a new kernel doesn't uninstall your old kernel. So all you have to do is boot to your old kernel, and remove the new kernel that isn't working for you.

understood, but how can you download a kernel via Update Manager if you don't have a working internet connection? i get the feeling i'm missing something here.

JerryF · Post by **JerryF** » Sat May 26, 2018 6:31 pm

Well, yes. No one can download anything from the internet if you're not connected to the internet. My suggestion was foolish.

There may be a way to download the files needed from another computer and then install the kernel(s) that way. Unfortunately, I am not knowledgeable with that.

Post by **JeremyB** » Sat May 26, 2018 7:03 pm

What does the command route show you in terminal? You have an IP address from your router and can ping outside IP addresses. I don't think this is simply a kernel issue

hooly · Post by **hooly** » Sun May 27, 2018 2:59 am

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$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.0.1     0.0.0.0         UG    100    0        0 enp0s25
link-local      *               255.255.0.0     U     1000   0        0 enp0s25
192.168.0.0     *               255.255.255.0   U     100    0        0 enp0s25

does that tell you anything?
this is what i get when i boot into another partition on the same machine (that does have internet access):

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$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         routerlogin.net 0.0.0.0         UG    100    0        0 enp0s25
link-local      *               255.255.0.0     U     1000   0        0 enp0s25
192.168.0.0     *               255.255.255.0   U     100    0        0 enp0s25

i see there's a difference in the default Gateway. no idea if that matters.

Post by **JeremyB** » Sun May 27, 2018 9:30 am

See what this command shows

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nmcli -f all device show | sed '/^GENERAL.DEVICE:[ ]\+lo$/,/^$/d; /^AP\[[0-9]\+\]\./d'

hooly · Post by **hooly** » Sun May 27, 2018 10:11 am

sure thing:

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$ nmcli -f all device show | sed '/^GENERAL.DEVICE:[ ]\+lo$/,/^$/d; /^AP\[[0-9]\+\]\./d'
GENERAL.DEVICE:                         enp0s25
GENERAL.TYPE:                           ethernet
GENERAL.NM-TYPE:                        NMDeviceEthernet
GENERAL.VENDOR:                         Intel Corporation
GENERAL.PRODUCT:                        Ethernet Connection (2) I218-V
GENERAL.DRIVER:                         e1000e
GENERAL.DRIVER-VERSION:                 3.2.6-k
GENERAL.FIRMWARE-VERSION:               0.1-4
GENERAL.HWADDR:                         D0:50:99:29:67:00
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.REASON:                         0 (No reason given)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:19.0/net/enp0s25
GENERAL.IP-IFACE:                       enp0s25
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     Wired connection 1
GENERAL.CON-UUID:                       b290bbf1-d5bf-356c-a135-22e6bd23bf11
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/0
GENERAL.METERED:                        no (guessed)
CAPABILITIES.CARRIER-DETECT:            yes
CAPABILITIES.SPEED:                     1000 Mb/s
CAPABILITIES.IS-SOFTWARE:               no
WIRED-PROPERTIES.CARRIER:               on
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{0}
CONNECTIONS.AVAILABLE-CONNECTIONS[1]:   b290bbf1-d5bf-356c-a135-22e6bd23bf11 | Wired connection 1
IP4.ADDRESS[1]:                         192.168.0.2/24
IP4.GATEWAY:                            192.168.0.1
IP4.ROUTE[1]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]:                             192.168.0.1
IP4.DNS[2]:                             8.8.8.8
DHCP4.OPTION[1]:                        requested_routers = 1
DHCP4.OPTION[2]:                        requested_domain_search = 1
DHCP4.OPTION[3]:                        requested_time_offset = 1
DHCP4.OPTION[4]:                        requested_domain_name = 1
DHCP4.OPTION[5]:                        requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[6]:                        requested_broadcast_address = 1
DHCP4.OPTION[7]:                        host_name = cina18-box
DHCP4.OPTION[8]:                        requested_wpad = 1
DHCP4.OPTION[9]:                        requested_netbios_scope = 1
DHCP4.OPTION[10]:                       next_server = 0.0.0.0
DHCP4.OPTION[11]:                       expiry = 1527516139
DHCP4.OPTION[12]:                       requested_interface_mtu = 1
DHCP4.OPTION[13]:                       requested_subnet_mask = 1
DHCP4.OPTION[14]:                       dhcp_lease_time = 86400
DHCP4.OPTION[15]:                       dhcp_message_type = 5
DHCP4.OPTION[16]:                       ip_address = 192.168.0.2
DHCP4.OPTION[17]:                       requested_static_routes = 1
DHCP4.OPTION[18]:                       requested_domain_name_servers = 1
DHCP4.OPTION[19]:                       routers = 192.168.0.1
DHCP4.OPTION[20]:                       broadcast_address = 192.168.0.255
DHCP4.OPTION[21]:                       requested_ntp_servers = 1
DHCP4.OPTION[22]:                       requested_netbios_name_servers = 1
DHCP4.OPTION[23]:                       domain_name_servers = 192.168.0.1
DHCP4.OPTION[24]:                       requested_ms_classless_static_routes = 1
DHCP4.OPTION[25]:                       subnet_mask = 255.255.255.0
DHCP4.OPTION[26]:                       network_number = 192.168.0.0
DHCP4.OPTION[27]:                       requested_host_name = 1
DHCP4.OPTION[28]:                       dhcp_server_identifier = 192.168.0.1
IP6.ADDRESS[1]:                         fe80::1862:97e1:3308:7900/64
IP6.GATEWAY:                            

GENERAL.DEVICE:                         enp3s0
GENERAL.TYPE:                           ethernet
GENERAL.NM-TYPE:                        NMDeviceEthernet
GENERAL.VENDOR:                         Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT:                        RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (Motherboard (one of many))
GENERAL.DRIVER:                         r8169
GENERAL.DRIVER-VERSION:                 2.3LK-NAPI
GENERAL.FIRMWARE-VERSION:               
GENERAL.HWADDR:                         D0:50:99:29:67:01
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.REASON:                         2 (Device is now managed)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0/net/enp3s0
GENERAL.IP-IFACE:                       
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     --
GENERAL.CON-UUID:                       --
GENERAL.CON-PATH:                       --
GENERAL.METERED:                        unknown
CAPABILITIES.CARRIER-DETECT:            yes
CAPABILITIES.SPEED:                     unknown
CAPABILITIES.IS-SOFTWARE:               no
WIRED-PROPERTIES.CARRIER:               off
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: 

$

Post by **JeremyB** » Sun May 27, 2018 10:31 am

What about

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cat /etc/resolv.conf

You may need to

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sudo dpkg-reconfigure resolvconf

Answer yes to enable dynamic updates

hooly · Post by **hooly** » Sun May 27, 2018 12:46 pm

ok, well, the short answer is that this is the output:

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$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1

i repeated it over the course of several minutes and the output didn't change. this after having done the "sudo dpkg-reconfigure resolvconf" as requested.

the longer answer is that i'm posting this from that same "formerly wouldn't connect to the internet" partition. in other words the problem seems to have suddenly disappeared!

i hate it when voodoo stuff like this happens.
does this make any sense to anyone?

ftr the output of "route" has now changed:

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$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         routerlogin.net 0.0.0.0         UG    100    0        0 enp0s25
link-local      *               255.255.0.0     U     1000   0        0 enp0s25
192.168.0.0     *               255.255.255.0   U     100    0        0 enp0s25

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