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?
john@john-Ubuntu:~$ sudo apt-get install ubuntu-restricted-extras
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?
john@john-Ubuntu:~$ sudo dpkg --configure -a
dpkg: error: dpkg status database is locked by another process
john@john-Ubuntu:~$ sudo lsof /var/lib/dpkg/lock
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/john/gvfs
      Output information may be incomplete.
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF     NODE NAME
dpkg    2844 root    3uW  REG    8,1        0 33030795 /var/lib/dpkg/lock
john@john-Ubuntu:~$