After the system unmounted the root partition I detected that some files are missing in the filesystem.

wifi and the gwibber icons disappeared from the indicator applet

I want to check if there are other files missing using the ls program and the locate program, which woks on indexes of a previous state of the filesystem.

Thus,

locate '/usr/share/icons/*' | xargs ls -d 2>&1 >/dev/null

serves for that purpose, and I can count the nonexistent files like this:

locate '/usr/share/icons/*' | xargs ls -d 2>&1 >/dev/null | wc -l

except for the case where filenames have blank spaces in them; and, not very surprisingly, that is the case with Ubuntu (OMG!! It is no longer "forbidden" like in good old times).

If I use:

locate '/usr/share/icons/*' | xargs -Iñ ls -d 'ñ' 2>&1 >/dev/null

it is not working because there is some kind of interference in the syntax between the redirections of the standard outputs and the use of the parameter -I.

Can anyone please help me with this syntax or giving another idea?