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I accidentally modified the default shell program /bin/bash for my user in /etc/passwd. I didn't set a root password in my ubuntu server installation.

Now I can't even login. Is there anything I can do?

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up vote 3 down vote accepted

Boot up into a live disk, mount the partition and fix /etc/passwd :)

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Or .. start your box in single user mode and modify your passwd file - ubuntu single user mode link.

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