I think /boot/efi is mounted on my system as shown by lsblk so I'm not sure why I got this error.
$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 931.5G 0 disk ├─sda1 8:1 0 128M 0 part ├─sda2 8:2 0 1000M 0 part ├─sda3 8:3 0 260M 0 part /boot/efi ├─sda4 8:4 0 500M 0 part ├─sda5 8:5 0 418.4G 0 part /media/tom/Windows8_OS ├─sda6 8:6 0 2G 0 part [SWAP] └─sda7 8:7 0 296.1G 0 part / sdd 8:48 1 3.7G 0 disk └─sdd1 8:49 1 3.7G 0 part -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1725409 Title: (/boot/efi not mounted) package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1725409/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
