I was running Ubuntu MATE LTS for a long time. Then i moved to Budgie LTS and then current version.
Here it starts that my machine (DELL XPS 850 - 16 GB RAM) stops frequently completely (several times a day). Then I moved to UBUNTU LTS and then to the current version. Same topic. Several times a day the machine freezes fully. No response, no key press. When i restart and look in /var/log i find no traces of the crash.
I' have 16GB RAM, 2GB swap and run Firefox mostly only firefox and evolution. Hibernation is turned off. Librenms is not showing any memory or cpu issues when it comes to a crash.
Problem is fixed now: I moved to Debian 11, no issue since then.
22 Answers
System "freezes" are often caused by running too many, too large programs and running out of available memory. Use free to see if you have swap space, read man mkswap swapon fstab to create some. Swap space must be contiguous. use mkswap or fallocate, not dd. Traditionally, swap space of 1.5 × RAM has been recommended, but YMMV. If you don't plan to hibernate your system, you can have less than 1.0 × RAM.
I have upgraded the ubuntu 21 10, and it started to freeze on startup (up to 2 minutes to start up), when before the upgrade it was starting up in 20 seconds.
Currently i have found that the problem is in linux kernel version. Ubuntu 21.10 by default runs on 5.13.0. so when i select 5.11.0 in GRUB menu it works fine.
