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Another process is using it (or apt command)
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That's
not the error message. - People, when you're encountering error messages, do listen to them - and when you're asking for help, please do post them, literally.
The original error message is,
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You will not be able to change your system settings in any way (install, remove or upgrade software), because another process is using the packaging system database (probably some other Adept application or apt-get or aptitude). Please close the other application before using this one.
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So, just close that other software-install program.
In your own case, you did reboot already - so no conflicting apps should be open. Hence something else went wrong, which left the system in an inappropriate state.
Anyways, with that literal error message at hand, a quick Google search returns:
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sudo rm /var/lib/dpkg/lock
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Thanks