I've experienced the same error in Jaunty Beta (both an upgrade from Intrepid and a fresh install). Removing packagekit gets rid of the error.
The error would present using Update Manager to "check" for updates, or when "reloading" Synaptic - (after reloading Synaptic and clicking Close on the error window Synaptic would also close). In either instance the updates would be found and display properly for download/installation. Apt is not effected. -- E: The package cache file is corrupted E: _cache->open() failed, please report. https://bugs.launchpad.net/bugs/257639 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs