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My computer crashed and my desktop does not load up and I have no terminal using ctrlaltt etc, so I uninstalled compiz from root shell prompt.

This has removed unity so now I need to re-install it in recovery mode:

apt-get install unity returns not using locking for read only lock file /var/lib/dpkg/lock

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You probably face the problem that everything is mounted read-only in the recovery-system. Please see my answer to "Is recovery mode supposed to hang..." about how to work around that.

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