I'm using Cassandra and it seems most restricted packages are installed by the default. And also codecs, totem-xine,mplayer, nVidia drivers and etc. I have used ubuntu before and, after an installation it requires to edit the sources list to add repos for most packages i need wich are installed by default in Mint. Now my question is, do i need to edit sources list of Mint also? I have added the Medibuntu repos for in ubuntu to get most of multimedia packages. though these packages are installed by the default, still do i need to edit and add repos? if i want, what repos should i add? if i don't want, will latest updates of packages that installed on my pc be available automatically?