sudo apt update ; sudo apt upgrade
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Hit:3 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:5 http://archive.canonical.com/ubuntu xenial InRelease
Hit:6 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu xenial InRelease
Get:7 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [95.7 kB]
Get:9 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [92.2 kB]
Fetched 188 kB in 1s (125 kB/s)
W: No sandbox user '_apt' on the system, can not drop privileges
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?
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?