Other related bugs suggest changing permissions on
~/.thumbnails or linking
~/.cache/thumbnails to that location. I have U 11.04 from an upgrade of 10.10 install. Nautilus is not updating its icons with thumbnails even though it is trying to write something into the first directory above.
I checked the effective UID GID pair in
/etc/passwd and compared it to the numerical UID and GID in the permissions:
grep user /etc/passwd
ls -n -d ~/'thumbnails
They match. Since I did an upgrade I was testing the hypothesis that the upgrade changed the UID and GID of the user in the password file but not in the file ownership. That is not the problem, here. The file manager has another problem.
Looking at the png files in
.thumbnails/normal shows that they were updated the last time the file manager was opened, reasonable dates and times of access, but that they did not have thumbnails of the files. In U 10.10 I used to get thumbs of images and HTML files and some other types, but no more.
I am weary of breakage in U every time it rolls a rev, and how fast systems fall out of support. It is making me think of looking for a more stable Linux.