[RESOLVED] Connection problems only with system related issues

[ineuw]

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System:    Host: lm190dt Kernel: 4.15.0-39-generic x86_64 bits: 64
           Desktop: Cinnamon 3.8.9  Distro: Linux Mint 19 Tara
Machine:   Device: desktop Mobo: ASRock model: B360 Pro4 serial: N/A
           UEFI: American Megatrends v: P3.00 date: 07/09/2018
CPU:       Dual core Intel Pentium Gold G5600 (-MT-MCP-) cache: 4096 KB
           clock speeds: max: 3900 MHz 1: 800 MHz 2: 800 MHz 3: 800 MHz 4: 800 MHz
Graphics:  Card: Intel Device 3e91
           Display Server: x11 (X.Org 1.19.6 )
           drivers: modesetting (unloaded: fbdev,vesa)
           Resolution: 1536x864@59.94hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics (Coffeelake 3x8 GT2)
           version: 4.5 Mesa 18.0.5
Audio:     Card Intel Device a348 driver: snd_hda_intel Sound: ALSA v: k4.15.0-39-generic
Network:   Card: Intel Ethernet Connection (7) I219-V driver: e1000e
           IF: eno1 state: up speed: 100 Mbps duplex: full mac: 70:85:c2:7b:78:7d
Drives:    HDD Total Size: 1636.1GB (0.7% used)
           ID-1: /dev/sda model: SanDisk_SDSSDHII size: 120.0GB
           ID-2: /dev/sdb model: ST1000DM003 size: 1000.2GB
           ID-3: /dev/sdc model: ST500DM002 size: 500.1GB
           ID-4: USB /dev/sdd model: Flash_Disk size: 15.7GB
Partition: ID-1: / size: 51G used: 9.0G (19%) fs: ext4 dev: /dev/sda5
           ID-2: swap-1 size: 2.15GB used: 0.00GB (0%) fs: swap dev: /dev/sdb11
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 31.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 202 Uptime: 24 min Memory: 1253.0/15706.2MB
           Client: Shell (bash) inxi: 2.3.56 

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Failed to fetch http://packages.linuxmint.com/dists/tara/InRelease  
Could not resolve 'packages.linuxmint.com'Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  
Could not resolve 'archive.ubuntu.com'Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  
Could not resolve 'archive.ubuntu.com'Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  
Could not resolve 'archive.ubuntu.com'Failed to fetch http://archive.canonical.com/ubuntu/dists/bionic/InRelease  
Could not resolve 'archive.canonical.com'Some index files failed to download. 
They have been ignored, or old ones used instead.

For the past several weeks I am having unending problems with the Internet connection relating to Linux repository updates of any kind. Software list update fails after it downloads 80-90% of the info, the update manager cannot update itself, and the same problem exists when I try using the Y-PPA manager. Switched repositories several times, but the problem persists with any selected repository. They all report an internet connection error even though I am connected without any problems with all other web applications.

Can download gigabytes of material from Internet Archive, use Cyberfox, and Vivaldi without any interruption, and work online, hours at a time without any problems. The connection is a 50mbit Ethernet, I also removed the OpenDNS gateways from IPv4 (which is the only one I use) just in case it is the source of the problem. In addition, this problem never happens in Windows.

[ineuw]

Issue is resolved. OpenDNS was the cause of the constant disconnect of the repositories. It took several attempts to remove the OpenDNS link. Even after removing it from the network settings, their test site https://www.opendns.com/welcome/ kept indicating a connection. First, I rebooted the router, (in which the ISP DNS is "hardcoded" and not changeable). Then rebooted Linux several times until it was gone. Now, updating the repositories is no longer a problem. Will bring it to the attention of OpenDNS.