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Message #09761
[Bug 1884915] Re: ubuntustudio-default-settings recommends linux-lowlatency thus breaking ubuntustudio focal image building
Hello Dimitri, or anyone else affected,
Accepted livecd-rootfs into focal-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.664.3 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed. Your feedback will aid us getting this
update out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance for helping!
N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.
** Changed in: livecd-rootfs (Ubuntu Focal)
Status: Confirmed => Fix Committed
** Tags added: verification-needed verification-needed-focal
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https://bugs.launchpad.net/bugs/1884915
Title:
ubuntustudio-default-settings recommends linux-lowlatency thus
breaking ubuntustudio focal image building
Status in live-build package in Ubuntu:
Invalid
Status in livecd-rootfs package in Ubuntu:
Confirmed
Status in ubuntustudio-default-settings package in Ubuntu:
Fix Released
Status in ubuntustudio-meta package in Ubuntu:
Invalid
Status in live-build source package in Focal:
Invalid
Status in livecd-rootfs source package in Focal:
Fix Committed
Status in ubuntustudio-default-settings source package in Focal:
Confirmed
Status in ubuntustudio-meta source package in Focal:
Invalid
Status in live-build source package in Groovy:
Invalid
Status in livecd-rootfs source package in Groovy:
Won't Fix
Status in ubuntustudio-default-settings source package in Groovy:
Fix Released
Status in ubuntustudio-meta source package in Groovy:
Invalid
Bug description:
[ Description ]
ubuntustudio-default-settings recommends linux-lowlatency thus
breaking ubuntustudio focal image building
$ reverse-depends linux-lowlatency
Reverse-Recommends
* ubuntustudio-lowlatency-settings
Reverse-Depends
* linux-lowlatency-hwe-18.04 [amd64]
* linux-lowlatency-hwe-18.04-edge [amd64]
Packages without architectures listed are reverse-dependencies in:
amd64, arm64, armhf, i386, ppc64el, s390x
Seeded packages in the Ubuntu archive must not depend on the linux
kernel. Installation, and defaultness of a kernel flavour must be
handled externally using livecd-rootfs kernel flavour picking, or some
other dynamic configuration.
The above resulted in transitevely linux-lowlatency packages getting
pulled into the ubuntustudio task, without a blacklist. Which means
that ABI encoded packages gain Task: ubuntustudio-desktop, and instead
of only installing/tracking the latest kernel, the ancient
5.4.0-16-lowlatency abi is also installed, and then production of
daily focal isos fails, as there are two lowlatency kernels on the
media.
[ Fix ]
The above description indicates what broke. The recommends means that
the Task field contains a specific kernel ABI. We'll fix this by
enumerating the packages that we need to ensure aren't included, and
make sure they are effectively considered as not part of the task.
[ QA ]
Build an ubuntustudio/focal ISO with the -proposed livecd-rootfs and
make sure that it builds successfully and boots.
[ Regression potential ]
This is about excluding kernel-related packages from the task
consideration. If it is wrong then they could be excluded from the
image completely. That should be obvious if the thing doesn't boot,
and we'll have to iterate again.
[ Original description ]
$ reverse-depends linux-lowlatency
Reverse-Recommends
* ubuntustudio-lowlatency-settings
Reverse-Depends
* linux-lowlatency-hwe-18.04 [amd64]
* linux-lowlatency-hwe-18.04-edge [amd64]
Packages without architectures listed are reverse-dependencies in:
amd64, arm64, armhf, i386, ppc64el, s390x
$ apt-cache show -a linux*lowlatency | grep -e Package -e Task
...
Package: linux-headers-5.4.0-26-lowlatency
Task: ubuntustudio-desktop
...
If the dependency is desired, that is ok, as long as the abi encoded
packages are blacklisted in the seed similar to the !linux-image-*
stanza.
see https://launchpad.net/~ubuntu-
cdimage/+livefs/ubuntu/focal/ubuntustudio/
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References