autoroot@autoroot:/etc/apt/sources.list.d$ sudo nano ia32-libs-raring.list
[sudo] password for autoroot: 
autoroot@autoroot:/etc/apt/sources.list.d$ sudo apt-get install python-xlib
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  python-support
The following NEW packages will be installed:
  python-support python-xlib
0 upgraded, 2 newly installed, 0 to remove and 50 not upgraded.
Need to get 191 kB of archives.
After this operation, 1,080 kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
WARNING: The following packages cannot be authenticated!
  python-support python-xlib
Install these packages without verification [y/N]? y
Err http://repo.iitd.ernet.in/ubuntu/ precise/universe python-support all 1.0.14ubuntu2
  501  Not Implemented
Err http://repo.iitd.ernet.in/ubuntu/ precise/universe python-xlib all 0.14+20091101-1
  501  Not Implemented
Failed to fetch http://repo.iitd.ernet.in/ubuntu/pool/universe/p/python-support/python-support_1.0.14ubuntu2_all.deb  501  Not Implemented
Failed to fetch http://repo.iitd.ernet.in/ubuntu/pool/universe/p/python-xlib/python-xlib_0.14+20091101-1_all.deb  501  Not Implemented
E: Unable to fetch some archives, maybe run