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Ubuntu 20.04.3 noisy image after login

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Booting works until login, then after entering my password I get a noisy screen (no graphical interface?). Luckily, I can press Ctrl+Alt+F5 to switch to a TTY (full-screen terminal). My first idea was to bring the system up-to-date before looking at the possible other solutions

sudo apt update
sudo apt dist-upgrade
sudo reboot

but this has not helped. Neither did reinstalling the the login manager:

sudo apt install --reinstall gdm3 ubuntu-desktop gnome-shell

It might(!) be an issue with the graphics driver, so I entered

lspci | grep VGA

leading to

07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev d3)

and

sudo dmidecode |grep Version

to

Version: AMD Ryzen 5 PRO 465U with Radeon Graphics
[...]
Version: ThinkPad T14 Gen 1

So now if I try to open some program which has a graphic interface I get the unable to open display error. For example:

anaconda-navigator

gives me

2022-01-20 13:05:27,513 - WARNING linux_scaling.get_scaling_factor_using_dbus:31
An exception occured during fetching list of system display settings.

qt.qpa.screen: QXcbConnection: Could not connect to display
Could not connect to any X display.
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