fsck goes through the system and tries to recover damaged files, it will put them into the lost+found folder. I guess this is basically a problem with
fsck creating that folder even if there's nothing to put in. As Ubuntu periodically runs those checks on your partitions, those folders will always be re-created, so deleting it won't work.
If you just want to hide the folder from Nautilus, you can create a '.hidden' file containing 'lost+found' and put it into the lost+found parent's folder.
Eg. for the lost+found folder in '/':
echo "lost+found" | sudo tee /.hidden
For the one in you home directory (if any):
echo "lost+found" > ~/.hidden
I guess alternatively you can remove them after every boot by adding the following to the file '/etc/rc.local':
if [ -d /lost+found ]; then
rmdir /lost+found 2>/dev/null
if [ -d /home/USER/lost+found ]; then
rmdir /home/USER/lost+found 2>/dev/null
This will run
rmdir on the folders if they exist, which only removes them if they are empty (
2>/dev/null will discard the "not empty" message from
rmdir). There probably aren't lots of directories, so I kept it simple. Just make sure 'exit 0' stays on the bottom line.
Downside: this only keeps track of directories created by
fsck during boot. If it's run at a later time, you'll again see that directory. You then could put above into a periodically executed cron job.