[SOLVED] Patchy internet connection since updating to 20.3 Una

[PringleBeagle]

Hello, hoping someone can help.

I'm using Mint 20.3 Una, Cinnamon - I updated from Uma a couple of weeks ago.
Since then despite getting successful wifi connection tray notifications, there's no internet connection.
I managed to resolve it by rolling back via Timeshift a couple of times, but that no longer fixes the issue. I can't even use my phone to tether via USB - there's still no internet connection. I've temporarily managed to get online by booting from the installation USB, i.e., 20.2 Uma.
I have a Broadcom adapter, which I'm guessing might be part of the issue?

Post updated

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System:    Kernel: 5.13.0-27-generic x86_64 bits: 64 compiler: N/A Desktop: Cinnamon 5.2.7 Distro: Linux Mint 20.3 Una 
           base: Ubuntu 20.04 focal 
Machine:   Type: Desktop System: LENOVO product: 10102 v: Lenovo C340 serial: <filter> 
           Mobo: LENOVO model: MAHOBAY v: Win8 STD MM DPK IPG serial: <filter> UEFI: LENOVO v: ELKT31AUS date: 03/21/2013 
Memory:    RAM: total: 3.72 GiB used: 1.39 GiB (37.3%) 
           RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:       Topology: Dual Core model: Intel Pentium G2030 bits: 64 type: MCP arch: Ivy Bridge rev: 9 L2 cache: 3072 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 11973 
           Speed: 1647 MHz min/max: 1600/3000 MHz Core speeds (MHz): 1: 1622 2: 1597 
Graphics:  Device-1: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics vendor: Lenovo driver: i915 v: kernel 
           bus ID: 00:02.0 
           Display: x11 server: X.Org 1.20.13 driver: modesetting unloaded: fbdev,vesa resolution: 1600x900~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 2500 (IVB GT1) v: 4.2 Mesa 21.0.3 direct render: Yes 
Audio:     Device-1: Intel 6 Series/C200 Series Family High Definition Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 
           Device-2: Z-Star Micro type: USB driver: snd-usb-audio,uvcvideo bus ID: 2-1.6:6 
           Sound Server: ALSA v: k5.13.0-27-generic 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8169 v: kernel port: e000 
           bus ID: 03:00.0 
           IF: enp3s0 state: down mac: <filter> 
           Device-2: Broadcom and subsidiaries BCM4313 802.11bgn Wireless Network Adapter driver: N/A port: e000 
           bus ID: 05:00.0 
           IF-ID-1: ipv6leakintrf0 state: unknown speed: N/A duplex: N/A mac: <filter> 
Drives:    Local Storage: total: 1.82 TiB used: 522.35 GiB (28.0%) 
           ID-1: /dev/sda vendor: Seagate model: ST1000DM003-1CH162 size: 931.51 GiB 
           ID-2: /dev/sdb type: USB vendor: Toshiba model: MQ01ABD100 size: 931.51 GiB 
Partition: ID-1: / size: 915.40 GiB used: 50.42 GiB (5.5%) fs: ext4 dev: /dev/sda2 
           ID-2: /boot/efi size: 511.0 MiB used: 5.2 MiB (1.0%) fs: vfat dev: /dev/sda1 
           ID-3: /media/ruth/ACBEC388BEC34992 size: 931.51 GiB used: 471.93 GiB (50.7%) fs: ntfs dev: /dev/sdb1 
           ID-4: /run/timeshift/backup raw size: 931.01 GiB size: <superuser/root required> used: <superuser/root required> 
           fs: ext4 dev: /dev/sda2 
Sensors:   System Temperatures: cpu: 40.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Repos:     No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/blaze-main-focal.list 
           1: deb http://ppa.launchpad.net/blaze/main/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb https://mirror.cov.ukservers.com/linuxmint una main upstream import backport
           2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
           3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
           4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
           5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
           6: deb http://archive.canonical.com/ubuntu/ focal partner
           Active apt repos in: /etc/apt/sources.list.d/protonvpn-stable.list 
           1: deb [signed-by=/usr/share/keyrings/protonvpn-stable-archive-keyring.gpg] https://repo.protonvpn.com/debian stable main
           Active apt repos in: /etc/apt/sources.list.d/sebastian-stenzel-cryptomator-focal.list 
           1: deb http://ppa.launchpad.net/sebastian-stenzel/cryptomator/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/vscode.list 
           1: deb [arch=amd64,arm64,armhf] http://packages.microsoft.com/repos/code stable main
Info:      Processes: 193 Uptime: 5m Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17 inxi: 3.0.38 

I've tried booting with previous kernels but this only makes things worse (wifi conections disappear completely)
My Timeshift doesn't include 20.2, as I guess it's been overwritten now? So I don't think I can downgrade.

[PringleBeagle]

OK, not sure if this is a full fix, but I just tried

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protonvpn-cli d

And internet connected!
I'll mark this as solved for the time being and hopefully it will hold after rebooting.

Update: Still working a day later. Found the solution here: https://www.reddit.com/r/ProtonVPN/comm ... nt/hty6gck. If others have ProtonVPN installed and having intermittent internet connectivity on Mint, it might be worth a try.