According to your dmesg.txt, it looks like your /dev/sda hard disk may be going bad...
[ 2125.964543] sd 0:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed [ 2125.964558] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 00 40 0b d0 00 00 30 00 [ 2125.964584] end_request: I/O error, dev sda, sector 4197334 [ 2125.964638] EXT4-fs error (device sda1): __ext4_get_inode_loc: inode #132518: (comm dpkg) [ 2125.964650] ata1: EH complete [ 2125.964658] unable to read inode block 524410 ** Changed in: keyutils (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/731779 Title: package keyutils 1.4-1 failed to install/upgrade: cannot remove `/target/usr/share/doc/keyutils/changelog.Debian.gz': Input/output error -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs