package lxd (not installed) failed to install/upgrade: new lxd package pre-installation script subprocess returned error exit status 1

[Andrei Coada]

A simple 'do-release-upgrade' from 18.04 to 20.04

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: lxd (not installed)
ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
Uname: Linux 4.15.0-122-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.11
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Nov 7 00:36:31 2020
ErrorMessage: new lxd package pre-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2019-01-22 (654 days ago)
InstallationMedia: Ubuntu-Server 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: lxd
Title: package lxd (not installed) failed to install/upgrade: new lxd package pre-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to focal on 2020-11-06 (0 days ago)

[Stéphane Graber (stgraber)]

error: cannot perform the following tasks:
- Setup snap "snapd" (9721) security profiles (cannot run udev triggers for input subsystem: exit status 1
udev output:
Failed to write 'change' to '/sys/devices/virtual/input/input5/uevent': Cannot allocate memory
)

That's a new one, it may be related to a kernel issue in this case or even hardware.

In any case, as it's not even hitting on the LXD snap, re-assigning to snapd.

[Andrei Coada (raziel.kernel)]

Quote:
"it may be related to a kernel issue in this case or even hardware."

I think this is a strong possibility.
The system is hosted on an old Xen hypervisor (although, I've never had this problem before, updating other VMs from 18.04 to 20.04).
Maybe it was a transient quirk. I still was able to finish the update successfully, nevertheless.