Vice is one of the most powerful and famous Commodore computers emulators (not Amiga), it is really like an emulation suite since each platform has a specific executable and you have to call from the console (and not only in GNU/Linux, although always we can create shortcuts).
Last Christmas the new version 3.0 was launched with a lot of improvements, but the programmers didn't launch binaries for any GNU/Linux distro, so we need download the source code, uncompress and compile it, but this is very easy typing the next commands in your console (copy & paste):
sudo apt-get install build-essential byacc texi2html flex libreadline-dev libxaw7-dev texinfo libxaw7-dev libgtk2.0-cil-dev libgtkglext1-dev libpulse-dev
tar -zxvf vice-3.0.tar.gz
./configure --enable-fullscreen --with-pulse --with-x --enable-gnomeui
You need copy the BIOS files in your folder .vice into $HOME folder, inside .vice must be a folder for each system:
C128 C64 CBM-II DRIVES PET VIC20
These are the commands to run each system:
x128 x64 x64dtv x64sc xcbm2 xcbm5x0 xpet xplus4 xscpu64 xvic
There are also tools to transfer data between your commodore and your PC as c1541 or cartconv to manage floppies or cartridges respectiveness.