Install Commodore emulator on Linux

Download tarball from emulator web page
Install dependencies sudo apt install build-essential libvte-dev libasound2-dev libgtk2.0-dev libgnome2-dev byacc flex
Extract tarball in terminal tar xvzf vice-3.1.tar.gz
Change to directory where you extracted tarball cd vice-3.1

Then configure, compile and install
./configure --enable-gnomeui
sudo make install

After installation to run C64 emulator type x64 in terminal
Load game x64 -autoload lastn2-1.d64

You have actually not only C64 emulator but also emulators for C128, VIC20, PET etc.

To run PET emulator type xpet in terminal