[Bug 1799785] [NEW] Upgrade to 18.04 fails because tcsh has changed location

[Xiaolin Zang]

Public bug reported:

After upgrading to 18.04, I can't login anymore because tcsh's assumed
location has been changed.  This makes my login repeatedly fail because
my login shell tcsh can't be found.  Fortunately there is another
account on my computer which uses bash shell with super user capability.
I'm able to login that way and fix the problem.  Then I have other
problems that must be fixed using dpkg --configure -a.  But those are
minor comparing to the tcsh problem.  If I had only one account which
used tcsh, my machine would be dead in water needing a complete
reinstall.  I suggest this problem be fixed ASAP.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.27
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 24 16:04:26 2018
InstallationDate: Installed on 2017-06-02 (509 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2018-10-23 (1 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1799785

Title:
  Upgrade to 18.04 fails because tcsh has changed location

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

Bug description:
  After upgrading to 18.04, I can't login anymore because tcsh's assumed
  location has been changed.  This makes my login repeatedly fail
  because my login shell tcsh can't be found.  Fortunately there is
  another account on my computer which uses bash shell with super user
  capability.  I'm able to login that way and fix the problem.  Then I
  have other problems that must be fixed using dpkg --configure -a.  But
  those are minor comparing to the tcsh problem.  If I had only one
  account which used tcsh, my machine would be dead in water needing a
  complete reinstall.  I suggest this problem be fixed ASAP.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.27
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct 24 16:04:26 2018
  InstallationDate: Installed on 2017-06-02 (509 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2018-10-23 (1 days ago)
  VarLogDistupgradeTermlog:

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