Ubuntu Studio ISO fails to build: "/usr/sbin/grub-probe: error: failed to get canonical path of `overlay'."

[Aaron Rainbolt]

Full build log is at https://launchpadlibrarian.net/717896339/buildlog_ubuntu_noble_amd64_ubuntustudio_BUILDING.txt.gz. Relevant section:

Preconfiguring packages ...
Fetched 692 MB in 4s (169 MB/s)
(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 347331 files and directories currently installed.)
Removing os-prober (1.81ubuntu3) ...
Removing memtest86+ (7.00-1) ...
Removing ubuntustudio-lowlatency-settings (24.04.14) ...
Removing plymouth-theme-ubuntustudio (24.04.1) ...
update-alternatives: removing manually selected alternative - switching default.plymouth to auto mode
update-alternatives: using /usr/share/plymouth/themes/bgrt/bgrt.plymouth to provide /usr/share/plymouth/themes/default.plymouth (default.plymouth) in auto mode
update-alternatives: using /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth to provide /usr/share/plymouth/themes/text.plymouth (text.plymouth) in auto mode
update-initramfs: deferring update (trigger activated)
/usr/sbin/grub-probe: error: failed to get canonical path of `overlay'.
dpkg: error processing package plymouth-theme-ubuntustudio (--remove):
 installed plymouth-theme-ubuntustudio package post-removal script subprocess returned error exit status 1
dpkg: too many errors, stopping
Errors were encountered while processing:
 plymouth-theme-ubuntustudio
Processing was halted because there were too many errors.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mate Kukri (mkukri)]

>The following packages will be REMOVED:
> grub-common grub2-common grub2-themes-ubuntustudio libefiboot1t64
> libefivar1t64 memtest86+ os-prober plymouth-theme-ubuntustudio
> ubuntustudio-lowlatency-settings

As vorlon pointed out to me, these removals a looks like *a problem* here, and I really hope they are *the problem" too

[Julian Andres Klode (juliank)]

Nothing to see here, really. grub has been rebuilt against libefivar1t64; and the mokutil rebuild hasn't migrated yet (or built on armhf), so it pulls in libefivar1, which then removes libefivar1t64 and therefore grub-common and other reverse dependencies.

[Steve Langasek (vorlon)]

It's not clear why installing mokutil would force install of the libefivar1 real package, when libefivar1t64 has a versioned Provides: of it; or why this would happen on one particular flavor when the grub code is rather generic across flavors. But if bumping mokutils through resolves it, we can remove the armhf binary to get this done sooner rather than later.

[Steve Langasek (vorlon)]

We have a successful daily build without mokutil migrating, so marking this invalid.

https://cdimage.ubuntu.com/ubuntustudio/dvd/20240307.2/

(mokutil anyway is blocked by openssl transition which will take a bit yet.)