I am using Ubuntu 12.04 and I don't get any updates.
For more than two weeks, whenever I try to check for updates manually it doesn't show any updates in the update manager. Then I tried via terminal using apt-get.
Then these following error messages are shown on the screen:
E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/lib/apt/lists/ E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
and I couldn't see any error symbol in the system tray