Messed up system a bit

[Steven Truppe]

Hi all,

my sources.list files looks like:


###### Ubuntu Main Repos
deb http://at.archive.ubuntu.com/ubuntu/ xenial main restricted universe 
multiverse
deb-src http://at.archive.ubuntu.com/ubuntu/ xenial main restricted 
universe multiverse

###### Backports
deb http://at.archive.ubuntu.com/ubuntu/ xenial-backports restricted 
multiverse main universe


My problem is that i'm not able to install gimp:
  gimp : Depends on: libgimp2.0 (>= 2.9.4~1-0x0~ppa~245bbbc) but should 
not be installed
             Depends on: libgimp2.0 (<= 2.9.4~1-z) but should not be 
installed
             Depends on: libgegl-0.3-0 (>= 1:0.3.6.20) but should not be 
installed

It seems like i somehow messed up the system during installing the 
binary nvidia drivers...
i'm using Ubuntu Desktop 16.04

# cat /proc/version:
Linux version 4.4.0-21-generic (buildd at lgw01-21) (gcc version 5.3.1 
20160413 (Ubuntu 5.3.1-14ubuntu2) ) #37-Ubuntu SMP Mon Apr 18 18:33:37 
UTC 2016
# uname -a
Linux workstation 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Can someone please help me get my system back so i can install gimp for 
example - a great help would be a pastebin of the original source.list 
file of the version...

Thanks in advance,
Truppe Steven