flash-kernel does not generate initramfs on SolidRun MACCHIATObin

[Stefan Kooman]

Ubuntu Focal installer hits the following in the installation process when flash-kernel gets triggerd:

Using DTB: marvell/armada-8040-mcbin.dtb
Couldn't find DTB armada-8040-mcbin.dtb on the following paths:
/etc/flash-kernel/dtbs /usr/lib/linux-image- /lib/firmware//device-tree/
Installing into /boot/dtbs//marvell/armada-8040-mcbin.dtb
cp: cannot stat '': No such file or directory

the DTB _is_ actually installed in "/boot/dtbs//marvell/armada-8040-mcbin.dtb". However, the initramfs is never created, maybe because of exit 1 code in the aforementioned output. Invoking "/usr/sbin/update-initramfs.curtin-disabled -u -k all" by hand does create a initramfs for all available kernels, and the system is able to boot fine afterwards.

I *think* this also prevents the Focal installer (curtin) to complete succesfully, but it reboots almost immediately after hitting an error, so I don't know for sure.

[RussianNeuroMancer (russianneuromancer)]

Seeing similar issue on Lenovo Yoga C630 WOS (SDM845-based) although initramfs is generated in m case. Log:

Using DTB: qcom/sdm850-lenovo-yoga-c630.dtb
Couldn't find DTB sdm850-lenovo-yoga-c630.dtb on the following paths: /etc/flash-kernel/dtbs /usr/lib/linux-image- /lib/firmware//device-tree/
Installing into /boot/dtbs//qcom/sdm850-lenovo-yoga-c630.dtb
cp: cannot stat '': No such file or directory

[Launchpad Janitor (janitor)]

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

[Stefan Kooman (stefan-n1)]

I have repeated the installation procedure and captured logging. flash-kernel exits with exit code 3:

2020-09-30 07:28:57,452 DEBUG subiquitycore.utils:83 arun_command ['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install'] exited with code 3
2020-09-30 07:28:57,453 ERROR root:39 finish: subiquity/InstallProgress/install/curtin_install: FAIL: Command '['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install']' returned non-zero exit status 3.
subprocess.CalledProcessError: Command '['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install']' returned non-zero exit status 3.
2020-09-30 07:28:57,452 DEBUG subiquitycore.utils:83 arun_command ['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install'] exited with code 3
2020-09-30 07:28:57,453 ERROR root:39 finish: subiquity/InstallProgress/install/curtin_install: FAIL: Command '['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install']' returned non-zero exit status 3.
subprocess.CalledProcessError: Command '['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install']' returned non-zero exit status 3.

and that gives the following logging in curtin:

2020-09-30 07:19:55,807 DEBUG root:39 start: subiquity/InstallProgress/install/curtin_install/cmd-install/stage-curthooks/builtin/cmd-curthooks/installing-kernel: installing kernel
2020-09-30 07:28:56,459 DEBUG root:39 finish: subiquity/InstallProgress/install/curtin_install/cmd-install/stage-curthooks/builtin/cmd-curthooks/installing-kernel: SUCCESS: Status.FAIL
2020-09-30 07:28:56,480 DEBUG root:39 finish: subiquity/InstallProgress/install/curtin_install/cmd-install/stage-curthooks/builtin: SUCCESS: Status.FAIL
2020-09-30 07:28:56,483 DEBUG root:39 finish: subiquity/InstallProgress/install/curtin_install/cmd-install/stage-curthooks: SUCCESS: Status.FAIL
2020-09-30 07:28:57,452 DEBUG subiquitycore.utils:83 arun_command ['systemd-cat', '--level-prefix=false', '--identifier=curtin_log.2566', '/snap/subiquity/1972/usr/bin/python3', '-m', 'curtin', '--showtrace', '-c', '/var/log/installer/subiquity-curtin-install.conf', 'install'] exited with code 3
2020-09-30 07:28:57,453 DEBUG subiquity.lockfile:44 unlocking exclusive /run/subiquity/installing
2020-09-30 07:28:57,453 ERROR root:39 finish: subiquity/InstallProgress/install/curtin_install: FAIL: Comma...