Apt-get install error

You may get following error when you use apt-get install command.

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?

Run ps command to see which processes are using apt.

# ps aux | grep apt
root       3701  0.0  0.0   4628   772 ?        Ss   01:17   0:00 /bin/sh /usr/lib/apt/apt.systemd.daily install
root       3705  0.0  0.0   4628  1680 ?        S    01:17   0:00 /bin/sh /usr/lib/apt/apt.systemd.daily lock_is_held install
_apt       3744  0.5  0.4  88960  8560 ?        S    01:18   0:00 /usr/lib/apt/methods/http
root       3755  0.0  0.0  21536  1000 pts/0    S+   01:18   0:00 grep --color=auto apt

Kill processes

# kill -9 3701
# kill -9 3705
# kill -9 3744

Check ps

# ps aux | grep apt

root       3757  0.0  0.0  21536  1028 pts/0    S+   01:18   0:00 grep --color=auto apt

After killing processes and restart apt-get install command I could install packages.

If you have interrupted apt-get session when you install a package you may see an error.

E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

In this case to continue setup run:

sudo dpkg --configure -a