This bug was fixed in the package less - 551-1ubuntu0.1
---------------
less (551-1ubuntu0.1) focal; urgency=medium
* On upgrade from packages that shipped less in both /bin and /usr/bin,
call update-alternatives in preinst, such that after unpacking,
/usr/bin/pager remains operational. This should resolve dpkg failing
to invoke pager by dpkg. LP: #1874953
-- Brian Murray <br...@ubuntu.com> Wed, 01 Jul 2020 16:25:13 -0700
** Changed in: less (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1874953
Title:
dpkg: conffile difference visualizer subprocess returned error exit
status 127
Status in dpkg package in Ubuntu:
Invalid
Status in less package in Ubuntu:
Fix Released
Status in smartmontools package in Ubuntu:
Invalid
Status in dpkg source package in Focal:
Invalid
Status in less source package in Focal:
Fix Released
Status in smartmontools source package in Focal:
Invalid
Status in dpkg source package in Groovy:
Invalid
Status in less source package in Groovy:
Fix Released
Status in smartmontools source package in Groovy:
Invalid
Status in dpkg package in Debian:
New
Status in less package in Debian:
Fix Committed
Bug description:
[Impact]
During a release upgrade to Ubuntu 20.04 LTS some users are not able to view
the differences made to a configuration file during the upgrade process. This
creates a bad user experience and leads to extra crash reports.
[Test Case]
1) Upgrade from a not usr-merged system (Ubuntu 16.04 LTS) to Ubuntu 18.04 LTS
2) Install the smartmontools package
3) Edit /etc/default/smartmontools (it's enough to just add a comment in
there)
4) Upgrade to Ubuntu 20.04 LTS (this requires do-release-upgrade -d as
20.04.1 is not out yet so release upgrades are not enabled)
To test the fix in the version of less from focal-proposed some
hackery of the release upgrader code will be necessary as it disables
proposed during the upgrade process. After enabling -proposed for
bionic you'll want to run do-release-upgrade -d, then cancel the
upgrade. After which you can cd to /tmp/ubuntu-release-
upgrader-$MKTMPDIR and edit DistUpgradeController.py and the if
statement around line 641 re "Disable proposed on upgrade to a
development release". Then run 'sudo ./focal'.
[Regression Potential]
None, as we are just calling update-alternatives in the preinst of less.
Issue occurred on upgrade from 19.10 to 20.04
ProblemType: PackageDistroRelease: Ubuntu 20.04
Package: smartmontools 7.1-1build1
ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Apr 24 21:33:08 2020
ErrorMessage: conffile difference visualizer subprocess returned error exit
status 127
InstallationDate: Installed on 2011-06-18 (3233 days ago)InstallationMedia:
Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64 (20110426)
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 2.0.2SourcePackage: smartmontools
Title: package smartmontools 7.1-1build1 failed to install/upgrade: conffile
difference visualizer subprocess returned error exit status 127
UpgradeStatus: Upgraded to focal on 2020-04-25 (0 days ago)
mtime.conffile..etc.default.smartmontools: 2017-12-08T19:12:02.064375
mtime.conffile..etc.smartd.conf: 2017-12-08T20:27:28.727282
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