For me its solved by FULLY cleaning the cache (may it will help somebody) :
u1sdtool -q rm -rf ~/.cache/ubuntuone rm -rf '~/.local/share/ubuntuone/syncdaemon' u1sdtool -c
It stopped scanning missing files, it's now syncing well.
For me its solved by FULLY cleaning the cache (may it will help somebody) :
u1sdtool -q share/ubuntuone /syncdaemon'
rm -rf ~/.cache/ubuntuone
rm -rf '~/.local/
u1sdtool -c
It stopped scanning missing files, it's now syncing well.