Update to #10:
After killing the original plymouthd process (the one running '@sbin/plymouthd --mode=boot --attach-to-session --pid-file=/run/plymouth/pid' as root) the installation continued and seems to have installed succesfully.
After reboot ubuntu started succesfully and I can also install the other tools I originally wanted to install.
This seems to be a workaround though I'd advice rebooting immediately after the apt install or update completed successfully, since plymouth is responsible for the splash/login screen and logging out/suspending will likely result in a crash of some kind.
Update to #10: /run/plymouth/ pid' as root) the installation continued and seems to have installed succesfully.
After killing the original plymouthd process (the one running '@sbin/plymouthd --mode=boot --attach-to-session --pid-file=
After reboot ubuntu started succesfully and I can also install the other tools I originally wanted to install.
This seems to be a workaround though I'd advice rebooting immediately after the apt install or update completed successfully, since plymouth is responsible for the splash/login screen and logging out/suspending will likely result in a crash of some kind.