This looks like an error from the USB media which you were installing as we see messages like this in syslog multiple times.
Sep 28 11:05:19 ubuntu kernel: [ 940.204801] EXT2-fs (loop1): error: ext2_lookup: deleted inode referenced: 818443 Sep 28 11:05:19 ubuntu kernel: [ 940.204928] EXT2-fs (loop1): error: ext2_lookup: deleted inode referenced: 818443 Sep 28 11:05:19 ubuntu kernel: [ 940.206808] EXT2-fs (loop1): error: ext2_lookup: deleted inode referenced: 818443 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1232423 Title: Installation problem To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1232423/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs