You can easily remove a package by running the command apt-get remove followed by the package name:
apt-get remove package_name
For example, if you are tired of the matrix lifestyle and have decided to remove the cmatrix package, you can run:
root@ubuntu-linux:/tmp# apt-get remove cmatrix
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
cmatrix
0 upgraded, 0 newly installed, 1 to remove and 357 not upgraded.
After this operation, 49.2 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 178525 files and directories currently installed.)
Removing cmatrix (1.2a-5build3) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Now, if you run the cmatrix command, you will get an error:
root@ubuntu-linux:/tmp# cmatrix
Command 'cmatrix' not found, but can be installed with:
apt install cmatrix
The apt-get remove command removes (uninstalls) a package,...