I tried to remove fs icons from my system and i get the error

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?

what is the problem???.....

Note: After downloading the package i couldn't fin it in my Downloads. I used the following command

sudo apt-get remove fs-icons-ubuntu