Bug#629983: [libc6] I also had this on possible upgrade to 2.13-6
Package: libc6 Version: 2.13-4 Please enter the report below this line. Problem is that, whatever be the offending file, the only alternatives are to go ahead anyway or abort ALL upgrades. On my system, six packages are pulled with lib6 upgrades. ...Message posted on the June 12th, 2011 - 1:50 PM ET
Bug#629983: libc6 install aborts with "A non-dpkg owned copy of the C library was found in /lib."
Judging from my upgrade experience I'd now say that the entire handling to me seems pretty much solidly wrong. I believe that I (as opposed to some other people?) _do_ have (almost) all files properly dpkg-managed, by the ldso package. Package: ...Message posted on the June 29th, 2011 - 11:30 AM ET