Since my Mac crashed and does not boot OS X at the moment, I am trying to recover some data from my user folder in OS X from within of Ubuntu.
Usually I have no problem accessing the files. But not this time.
I have stumbled upon these really strange permissions and I cannot change them. What are these?
Using sudo chmod... and sudo chown... is not possible and I get a message saying: (translated) no access possible: input/output error
d????????? ? ? ? ? ? matthias
When you don't have permission to a folder in Ubuntu (and various other Linux OSs), you will get d?????????.
To recursively fix the permissions, use this command:
chmod -R a+rX matthias
From this answer on Ask Ubuntu:
To read a file, its read permission needs to be set. However, to read a directory and the listing of its files, both the read and the execute permissions need to be set. If they aren't, you get weird errors like the ones you're experiencing.
d--------- for directories I don't have access to under OS X.
??? for no permissions when I try to access certain folders on my Mac over the network or drives plugged in (in which case I do a chmod -R a+rX <directoryname>).
chmod and chown with sudo - but it in both cases I get the message: (translated) no access possible: input/output error