installation stopped by an random exception from mark_install() in Cache class of python3-apt

[Alex Tu]

Exception in the installation

Aug 12 19:26:59 ubuntu /plugininstall.py: Exception during installation:
Aug 12 19:26:59 ubuntu /plugininstall.py: Traceback (most recent call last):
Aug 12 19:26:59 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 235, in run
Aug 12 19:26:59 ubuntu /plugininstall.py: self.install_extras()
Aug 12 19:26:59 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1212, in install_extras
Aug 12 19:26:59 ubuntu /plugininstall.py: self.do_install(filtered_extra_packages)
Aug 12 19:26:59 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 941, in do_install
Aug 12 19:26:59 ubuntu /plugininstall.py: mark_install(cache, pkg)
Aug 12 19:26:59 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 553, in mark_install
Aug 12 19:26:59 ubuntu /plugininstall.py: raise InstallStepError(
Aug 12 19:26:59 ubuntu /plugininstall.py: ubiquity.install_misc.InstallStepError: Unable to install 'libgbm1' due to conflicts.

This happen in oem project because we have lots pkg to upgrade during installation because the design of factory process need it.

As package list have certain dependency, and the the order that we get the pkg from the python set object is not good for underlying apt engine, then exception will raise.

[Alex Tu (alextu)]

for 1. improve the fault tolerance of Ubiquity while it calling external library.

We are trying to have severial times retry in ubiquity before thow out the exception.
And the installation testing is in progress.

[Alex Tu (alextu)]

I'm trying to upload log, but keep getting launchpad opps.
(Error ID: OOPS-6b4d02cb9bb92efa8664d821b400a951)
So, I will try uploading syslog later.

[Yuan-Chen Cheng (ycheng-twn)]

https://git.launchpad.net/ubuntu/+source/ubiquity/tree/ubiquity/install_misc.py?h=ubuntu/focal-updates#n534

[Yuan-Chen Cheng (ycheng-twn)]

the patch that passed 50 installtion

[Yuan-Chen Cheng (ycheng-twn)]

as this happens, I found the real exception is give by

  File "/usr/lib/python3/dist-packages/apt/package.py", line 1549, in mark_install
    fixer.resolve(True)
apt_pkg.Error: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

the package cause this error is: libgbm1

I found as it happens, if it failed:

===
# apt-get install -s evolution-data-server libgbm1
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 evolution-data-server : Depends: libedataserverui-1.2-2 (= 3.36.4-0ubuntu1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
===

However, If I
"apt-get install -s evolution-data-server libgbm1 libegl-mesa0"

Then there is no error

[Yuan-Chen Cheng (ycheng-twn)]

the dpkg -l as this happens

[Yuan-Chen Cheng (ycheng-twn)]

the pkg list we want to mark install as we run to there.

[Yuan-Chen Cheng (ycheng-twn)]

Note: the patch will not change the flow if not exception happens in

mark_install(cache, pkg)

Given so, I think there won't have regression if we apply this.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "install_misc_py.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Yuan-Chen Cheng (ycheng-twn)]

If we decide to take this, SRU back to focal is needed, given most OEM use LTS.

[Shih-Yuan Lee (fourdollars)]

The fix for LP: #1908023 will cover/replace the fix of this bug.