Ok. I found out my keyboard did not work on the computer so I finally used another keyboard and typed 'sudo dpkg --configure -a' in the terminal and it worked. Thank you all for helping me.
-- E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem. E: _cache->open() failed, please report. https://bugs.launchpad.net/bugs/326773 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs