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3

Many operations on directories require execute (search) permission in addition to read permission. chmod 666 clears the x bits, causing strange failures of ls and other basic stuff. Reasonable default permissions might be 644 for files and 755 for directories.


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Well, I figured it out! Most of the functionality in my home directory relied on the group permission, not just my individual user permission. After I changed the group permission to read / write / create + delete files, everything went back to normal :-) Hopefully this helps someone else out there in time!


3

If the software root is using can be configured to do "evil" stuff (or to display information in some unexpected way so that the root user does "evil" stuff out of not-knowing or false knowledge) by the config file, then that is a viable attack. In general, you weaken security, if access rights to edit ~/<configfile> can be more easily gained for that ...


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In your case the disk seems to be full and your home directory is big enough; I would say there is no need for complicated procedures, and the best strategy is creating different home user directories between Debian and Ubuntu bellow home. As in /home/debian/userand /home/ubuntu/user. To change the default base $HOME, both in Ubuntu and Debian, edit ...



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