I changed the permissions of /usr in Ubuntu to 700.
Graphics are not working. In a tty I have no access to sudo to change permissions back again.
I tried to access root from 'advanced boot option' and run the command chmod 755 /usr but it said something like 'read only file' and the permissions didn't change.
One of my friends also tried by mounting the drive and changing owner, but nothing seems to be working.
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