I realized that there is something to do with the repository dominik-stadler in the error message below.
WARNING: The following packages cannot be authenticated!
libserf1 libsvn1 subversion
Authentication warning overridden.
Get:1 http://ppa.launchpad.net/dominik-stadler/subversion-1.7/ubuntu/ lucid/main libserf1 1.0.0-2ubuntu0~ppa3 [42.6kB]
Get:2 http://ppa.launchpad.net/svn/ppa/ubuntu/ lucid/main libsvn1 1.7.9-0svn1~lucid+svn1 [1,095kB]
Get:3 http://ppa.launchpad.net/svn/ppa/ubuntu/ lucid/main subversion 1.7.9-0svn1~lucid+svn1 [1,292kB]
So i went to first purged subversion & libserf1 i.e sudo apt-get purge subversion
and sudo apt-get purge libserf1
, then went to /etc/apt/sources.list.d
and removed the following files
dominik-stadler-subversion-1.7-lucid.list
dominik-stadler-subversion-1.7-lucid.list.save
and later a simple sudo apt-get install subversion
installed everything perfectly.
I have no clue why/how this works, but thought i'd just document this here for someone else to benefit.