It's my first time with Ubuntu 22.04.
I've re-done a format, because previously, log files such as syslog and kern.log (at /var/log) kept writing the same error messages (I suppose) and fulled my hard drive. The messages were about the same as in this case.
I deleted them, but the machine kept going slowly. I opened the the System Monitor and saw that a gnome-shell was using most of my CPU. I killed it, and the UI disappeared; I knew I had messed up.
At the moment I'm typing from a fresh install, but I'm afraid this uncontrolled spam will begin sooner or later. What should I do? I've read it might have to do with BIOS, but I don't want to mess it up; better just follow the advice of some expert.
Edit: I solved this problem by replacing line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash loglevel=3 vga=current pcie_aspm=off" in /etc/default/grub.
