[Bug 1885360] [NEW] Chosing option to graphically 3-way merge configuration of services crashes the upgrader shortly leaving system in inconsistent state

[Bartłomiej Żogała]

Public bug reported:

This happened during sshd upgrade leaving no functional
/etc/ssh/sshd_config - only one file with suffix

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.19
ProcVersionSignature: Ubuntu 5.4.0-39.43-lowlatency 5.4.41
Uname: Linux 5.4.0-39-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Sat Jun 27 10:02:47 2020
InstallationDate: Installed on 2020-01-29 (149 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to focal on 2020-06-27 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal

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https://bugs.launchpad.net/bugs/1885360

Title:
  Chosing option to graphically 3-way merge configuration of services
  crashes the upgrader shortly leaving system in inconsistent state

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  This happened during sshd upgrade leaving no functional
  /etc/ssh/sshd_config - only one file with suffix

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.19
  ProcVersionSignature: Ubuntu 5.4.0-39.43-lowlatency 5.4.41
  Uname: Linux 5.4.0-39-lowlatency x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Sat Jun 27 10:02:47 2020
  InstallationDate: Installed on 2020-01-29 (149 days ago)
  InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Release amd64 (20191017)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to focal on 2020-06-27 (0 days ago)
  VarLogDistupgradeTermlog:

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