Hot answers tagged users
It is because you may have deleted the user and now dpkg queries /etc/passwd to compare with the statoverride file, it checks that all entries of the statoverride file are in the passwd, and if they are not, issue a warning, which is what is happening. That is easily fixable if you reconfigure/reinstall the relevant package (in your case it was mediatomb, ...
You can open a terminal and run sudo nautilus. You should gain access to your files.
Postgres is an open source database management system, which Metasploit uses for its database. As a result, during the installation, a new 'postgres' user was created. Because I don't know how Metasploit was installed, I don't know what was set as the password. If the extra user account is bothersome, you can always hide the account using this method.
I am no Metasploit expert, but this guide says that it uses PostgreSQL. PostgreSQL, like many other services on Ubuntu (like Apache, nginx, MySQL, nslcd, etc.), runs a daemon as a separate user. This helps in security. Login should be disabled for this user by default (so, no password). The PostgreSQL account shouldn't be visible on LightDM (it should be ...
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