The version of less from focal-proposed resolved the issue and I'm now
able to view the diff.
Configuration file '/etc/default/smartmontools'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** smartmontools (Y/I/N/O/D/Z) [default=N] ? d
--- /etc/default/smartmontools 2020-07-01 15:02:20.945403642 -0700
+++ /etc/default/smartmontools.dpkg-new 2019-10-09 17:32:47.000000000 -0700
@@ -4,9 +4,6 @@
# List of devices you want to explicitly enable S.M.A.R.T. for
# Not needed (and not recommended) if the device is monitored by smartd
#enable_smart="/dev/hda /dev/hdb"
-enable_smart="/dev/vda"
-# uncomment to start smartd on system startup
-#start_smartd=yes
# uncomment to pass additional options to smartd on startup
#smartd_opts="--interval=1800"
Configuration file '/etc/default/smartmontools'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** smartmontools (Y/I/N/O/D/Z) [default=N] ? z
Useful environment variables:
- DPKG_SHELL_REASON
- DPKG_CONFFILE_OLD
- DPKG_CONFFILE_NEW
Type 'exit' when you're done.
root@clean-xenial-amd64:/# apt-cache policy less
less:
Installed: 551-1ubuntu0.1
Candidate: 551-1ubuntu0.1
Version table:
*** 551-1ubuntu0.1 500
500 http://ubuntu.osuosl.org/ubuntu focal-proposed/main amd64 Packages
100 /var/lib/dpkg/status
551-1 500
500 http://ubuntu.osuosl.org/ubuntu focal/main amd64 Packages
** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to less in Ubuntu.
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 Committed
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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