Thanks for reporting this error. The DpkgTerminalLog.txt shows that the upgrade failed because the file /etc/apparmor.d/abstractions/mysql has been removed. That file is required. Please grab a new copy by doing
sudo apt-get install --reinstall apparmor dpkg -x /var/cache/apt/archives/apparmor_*.deb x sudo cp x/etc/apparmor.d/abstractions/mysql /etc/apparmor.d/abstractions/ Then re-try your upgrade. If that does not work or you need more help, please rrespond to this mail. ** Changed in: mysql-5.5 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to mysql-5.5 in Ubuntu. https://bugs.launchpad.net/bugs/1102971 Title: package mysql-server-5.5 5.5.28-0ubuntu0.12.04.3 failed to install/upgrade: 설치한 post-installation 스크립트 하위 프로세스가 오류 1번을 리턴했습니다 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/1102971/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs