while back I had a problem with my Linux Mint.
Programmes took an age to shut down, sometimes taking several minutes. It wasn’t confined to one programme. Any programme seemed to be affected. Also I would occasionally get a screen full of code on shut down [or boot, I can’t remember!] that flew past too quickly to read.
Then I started getting messages that my disk was full. This was worrying as I have a 1Tb HDD with windows/Linux dual boot. The Linux root partition was 50Gb and the home partition was 500Gb, both being big enough to avoid problems. Or so I thought. It was the root partition that was nearly full.
A quick check with Disk Usage Analyzer showed that the problem was log files. Tons of ’em. I deleted them [carefully].
Next I took a photo of the scrolling text. That at least allowed me to read some of it.
I selected a likely looking piece from one of the lines – “PCIe bus error severity=corrected” – and did a search on the web. I quickly found a solution.
Edit the file “/etc/default/grub” as Root user [making a backup of it first, of course].
Change the line
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash pci=noaer”
Save it and run update-grub.
Everything now loads and shuts down smoothly and quickly.