package less 487-0.1 failed to install/upgrade: new less package pre-installation script subprocess returned error exit status 2

[Guillaume]

Ocurred during bionic to focal upgrade.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: less 487-0.1
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Oct 6 09:47:23 2020
DuplicateSignature:
 package:less:487-0.1
 Preparing to unpack .../007-less_551-1ubuntu0.1_amd64.deb ...
 update-alternatives: error: cannot stat file '/etc/mysql/my.cnf.fallback': Too many levels of symbolic links
 dpkg: error processing archive /tmp/apt-dpkg-install-W2kFIm/007-less_551-1ubuntu0.1_amd64.deb (--unpack):
  new less package pre-installation script subprocess returned error exit status 2
Ec2AMI: ami-00000002
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: vps-cloud-2
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ErrorMessage: new less package pre-installation script subprocess returned error exit status 2
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: less
Title: package less 487-0.1 failed to install/upgrade: new less package pre-installation script subprocess returned error exit status 2
UpgradeStatus: Upgraded to focal on 2020-10-06 (0 days ago)

[Guillaume (e1msih)]

It was due to an issue with mysql /etc/mysql/my.cnf.fallback file.
This bug can be closed.