Before downloading packages from other sources, check if such a package is already in the Raspberry Pi repositories. I am used to using somewhat easier synaptic
in X and am just learning how to use the old terminal program aptitude
. Run it in a terminal (or lxterninal):
Whenever you run it, first hit "u
" (unless just done recently) to update packages and wait. You can search by entering "/
" and search term. When you find a package you want, hit "+
" (usually: Shift +/= key). Then "g
" will go (lists pkgs, then do again to install). Or "q
" at any time to quit.
If you get any outside packages, make sure that they are the proper architecture for the ARM cpu (if not just scripts). Files for a regular PC (x86 or amd64) will not work. Debian uses .deb files. Files ending in .rpm are for RedHat or Fedora.
Files ending with .tgz or tar.gz are zipped files and directories that xarchiver should be able to extract. But they do not necessarily install unless there is a script within that content that you need to run (see if there is a README file included in extracted files or directories).
For extracting .tgz or tar.gz files in a terminal you would do the following (or .tgz if file name ends with that):
tar -xzvf filename.tar.gz
Type man tar
in a terminal and hit Enter for more info