This looks like your Ubuntu partition was remounted read-only in the middle of a dpkg upgrade, which usually indicates a hard disk failure. I suggest to reboot into rescue mode, run an fsck, and "fix packages", double-check that you have a backup of your data, and watch out for more instances of this.
** Changed in: systemd (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/1581269 Title: package systemd 229-4ubuntu4 [modified: usr/share/dbus-1/system- services/org.freedesktop.systemd1.service] failed to install/upgrade: unable to securely remove '/usr/bin/systemd-detect-virt.dpkg-new': Read-only file system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1581269/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs