Comment 2 for bug 1767664

Apr 28 15:11:00 ubuntu-mate grub-installer: info: Calling 'apt-install grub-efi-amd64-signed' failed
Apr 28 15:11:29 ubuntu-mate ubiquity[1878]: Reverting lockdown of the desktop environment.
Apr 28 15:11:29 ubuntu-mate activate-dmraid: No Serial ATA RAID disks detected
Apr 28 15:11:29 ubuntu-mate /plugininstall.py: log-output -t ubiquity umount /target/cdrom
Apr 28 15:11:29 ubuntu-mate finish-install: Disabling CDROM entries in sources.list
Apr 28 15:11:29 ubuntu-mate /plugininstall.py: Exception during installation:
Apr 28 15:11:29 ubuntu-mate /plugininstall.py: Traceback (most recent call last):
Apr 28 15:11:29 ubuntu-mate /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1739, in <module>
ubuntu-mate /plugininstall.py: install.run()
ubuntu-mate /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 61, in wrapper
ubuntu-mate /plugininstall.py: func(self)
ubuntu-mate /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 227, in run
ubuntu-mate /plugininstall.py: self.configure_bootloader()
ubuntu-mate /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 971, in configure_bootloader
ubuntu-mate /plugininstall.py: "GrubInstaller failed with code %d" % ret)
ubuntu-mate /plugininstall.py: ubiquity.install_misc.InstallStepError: GrubInstaller failed with code 1
ubuntu-mate /plugininstall.py:
ubuntu-mate partman: No matching physical volumes found
ubuntu-mate partman: Reading volume groups from cache.

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ubuntu-mate ntfsresize: Collecting resizing constraints ...
ubuntu-mate ntfsresize: You might resize at 157045387264 bytes or 157046 MB (freeing 13233 MB).
ubuntu-mate ntfsresize: Please make a test run using both the -n and -s options before real resizing!
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What kind of insta