Please let me know about the result from a memtest. Even if the machine works fine most of the time a bitflip error might cause this kind of error. A upgrade stresses the machine a lot more than regular use.
-- package update-manager 1:0.87.27 failed to install/upgrade: ErrorMessage: SystemError in cache.commit(): E:Sub-process /usr/bin/dpkg returned an error code (1), E:Sub-process /usr/bin/dpkg returned an error code (1), E:Sub-process /usr/bin/dpkg returned an error code (1) https://bugs.launchpad.net/bugs/245748 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