Comment 5 for bug 817912

Jul 29 08:10:21 mint grub-installer: info: architecture: amd64/efi
Jul 29 08:10:22 mint grub-installer: info: Identified partition label for /dev/sda5: msdos
Jul 29 08:10:23 mint grub-installer: dpkg: warning: there's no installed package matching grub
Jul 29 08:10:23 mint grub-installer: dpkg: warning: there's no installed package matching grub-legacy
Jul 29 08:10:23 mint grub-installer: dpkg: dependency problems prevent removal of grub-pc:
Jul 29 08:10:23 mint grub-installer: startupmanager depends on grub | grub-pc; however:
Jul 29 08:10:23 mint grub-installer: Package grub is not installed.
Jul 29 08:10:23 mint grub-installer: Package grub-pc is to be removed.
Jul 29 08:10:23 mint grub-installer: dpkg: error processing grub-pc (--purge):
Jul 29 08:10:23 mint grub-installer: dependency problems - not removing
Jul 29 08:10:23 mint grub-installer: dpkg: dependency problems prevent removal of grub-gfxpayload-lists:
Jul 29 08:10:23 mint grub-installer: grub-pc depends on grub-gfxpayload-lists.
Jul 29 08:10:23 mint grub-installer: dpkg: error processing grub-gfxpayload-lists (--purge):
Jul 29 08:10:23 mint grub-installer: dependency problems - not removing
Jul 29 08:10:23 mint grub-installer: Errors were encountered while processing:
Jul 29 08:10:23 mint grub-installer: grub-pc
Jul 29 08:10:23 mint grub-installer: grub-gfxpayload-lists
Jul 29 08:10:23 mint ubiquity: umount: /target/cdrom: not found
Jul 29 08:10:23 mint plugininstall.py: log-output -t ubiquity umount /target/cdrom
Jul 29 08:10:23 mint finish-install: Disabling CD in sources.list
Jul 29 08:10:23 mint plugininstall.py: Exception during installation:
Jul 29 08:10:23 mint plugininstall.py: Traceback (most recent call last):
Jul 29 08:10:23 mint plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1551, in <module>
Jul 29 08:10:23 mint plugininstall.py: install.run()
Jul 29 08:10:23 mint plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 56, in wrapper
Jul 29 08:10:23 mint plugininstall.py: func(self)
Jul 29 08:10:23 mint plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 201, in run
Jul 29 08:10:23 mint plugininstall.py: self.configure_bootloader()
Jul 29 08:10:23 mint plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 844, in configure_bootloader
Jul 29 08:10:23 mint plugininstall.py: "GrubInstaller failed with code %d" % ret)
Jul 29 08:10:23 mint plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Jul 29 08:10:23 mint plugininstall.py: