This
question seems to be related but it doesn't have an answer.
https://trisquel.info/en/forum/partition-problems
Yesterday I tried to copy some files over from my portable hard drive
and I got an error telling me I had ran out of disk space. I thought it
was weird, because I barely had any files on my computer. I started
gnome-disks and it told me most of my disk was free space. I also saw a
little (1 KiB iirc) partition with an unknown partition type. I tried to
format it with NTFS but then all of the default Trisquel partitions
turned into one 20 GB bootable Ext4 partition. At first I thought it
didn't really matter, so I attempted to format the left over free space
but I got an error about the selected range colliding with a different
partition.
After restarting my computer, the only thing which shows up is the
Trisquel logo on the default wallpaper, and a message saying
"keys:Continue to wait, or Press S to skip mounting or M for manual
recovery." When I press S it takes me to a loop where the login screen
takes me back to the login screen.
How can I get it back to normal?