Some images on ibmcloud have an issue when installing new kernels (and thus rebuilding the initramfs and grub config files).
# apt-get upgrade
...
Processing triggers for initramfs-tools (0.130ubuntu3.9) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-42-generic
I: The initramfs will attempt to resume from /dev/vdc
I: (UUID=083a8bfd-95a8-4808-bd75-ed3c1be04dd4)
I: Set the RESUME variable to override this.
Setting up ubuntu-server (1.417.4) ...
Processing triggers for linux-image-4.15.0-99-generic (4.15.0-99.100) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-99-generic
I: The initramfs will attempt to resume from /dev/vdc
I: (UUID=083a8bfd-95a8-4808-bd75-ed3c1be04dd4)
I: Set the RESUME variable to override this.
/etc/kernel/postinst.d/x-grub-legacy-ec2:
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
uuid not supported. update 'groot' in /boot/grub/menu.lst
groot must be grub root device (ie '(hd0)'). not 'LABEL=cloudimg-rootfs'
run-parts: /etc/kernel/postinst.d/x-grub-legacy-ec2 exited with return code 1
dpkg: error processing package linux-image-4.15.0-99-generic (--configure):
installed linux-image-4.15.0-99-generic package post-installation script subprocess returned error exit status 1
Processing triggers for ureadahead (0.100.0-21) ...
Errors were encountered while processing:
linux-image-4.15.0-99-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)
Ooof. Very annoying.
Until we get a fix everywhere, you can fix this very easily yourself.
Edit: /boot/grub/menu.lst
Find this section:
...
## default grub root device
## e.g. groot=LABEL=cloudimg-rootfs
# groot=LABEL=cloudimg-rootfs
...
Change # groot=LABEL=cloudimg-rootfs
to # groot=(hd0)
(leaving the comment)
Then have the package manager try again
# apt-get install -f
This should succeed without issue. Then you can reboot to test the change
# reboot
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