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modprobe: ERROR: could not insert 'iwlwifi': Required key not available
This is a new issue in Ubuntu. I suggest that you register and file a bug report:...
Well I found the solution myself, I just had to change the location of the backup from the Storage Location in the Backup settings
Thanks to user sisco311 from ubuntuforums.org for this answer.
I didn't try it but the link posted above shows a command...
free
is already based on the system-wide memory usage.
If you want something on a per-user basis, you could try something like:
ps aux | awk...
As a temporary fix, you can also boot your system with a previous kernel image if you don't have the habit to remove them. In my case RESTART + hit the ESC key sent me to boot menu, select...