Ubuntu: Installing/fixing TP-Link AC1200 (T4UH 1.0) drivers in Ubuntu 20.04 LTS

I wrote an entry about this adapter and Ubuntu 18.04. This week my 20.04 LTS installation started to freeze randomly. I suspected several things, but through a process of elimination it ended up pointing to the Wi-Fi adapter. I can’t rule out a hardware issue yet, but the new driver…

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Ubuntu 20.4: Virtualbox not running after the last upgrade

When launching a VM in Virtualbox I got an error saying that it can’t be started because a required module isn’t loaded. It suggests to manually load it. Re-installing Virtualbox also fails because the virtualbox-dkms package can’t be configured The last system update upgraded the kernel from 5.4 to 5.8,…

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Ubuntu: System freezing for a few seconds with iwlwifi microcode sw error

For a few months now my main system would momentarily freeze or stall (usually about 20-30 seconds) and then continue working. It was something that started after one system update and wasn’t fixed with any further updates. I opened a bug with Debian without much luck. The system would notify…

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Ubuntu/Linux: systemd-resolved[2344]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.

In one of my systems the system log was reporting every 2-3 minutes the following error message: This was caused by a mismatch between the systemd configuration and /etc/resolv.conf. /etc/resolv.conf should be a symbolic link pointing to the systemd DNS configuration in /run/systemd/resolve/resolv.conf You can check if this is in…

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Ubuntu: Ubuntu 20.4 installing NVIDIA drivers breaks built-in audio on laptop

On a new laptop I couldn’t get the external HDMI monitor to work with the nouveau drivers, so I installed the NVIDIA drivers (version 440). The NVIDIA drivers worked perfectly and the external monitor could be configured, but it didn’t take too long to notice that the built-in audio wasn’t…

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