bash syntax error in the postinst script

Bug #1692181 reported by Ankit Pati
This bug affects 51 people
Affects Status Importance Assigned to Milestone
grub2 (Ubuntu)
Fix Released

Bug Description

Description: Ubuntu 16.04.2 LTS
Release: 16.04

  Installed: 2.02~beta2-36ubuntu3.10
  Candidate: 2.02~beta2-36ubuntu3.10
  Version table:
 *** 2.02~beta2-36ubuntu3.10 500
        500 xenial-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     2.02~beta2-36ubuntu3.9 500
        500 xenial-updates/main amd64 Packages
     2.02~beta2-36ubuntu3 500
        500 xenial/main amd64 Packages

Line 699 of the following post-installation script


reads thus, after the latest update.

      if dpkg --compare-versions "$2" lt-nl 2.02~beta2-36ubuntu3.10 then

Notice the missing semicolon before the then clause of the if statement.

It should really be

      if dpkg --compare-versions "$2" lt-nl 2.02~beta2-36ubuntu3.10 ; then

Fortunately, I noticed the issue from the dist-upgrade output, and fixed it before rebooting the machine as requested by Software Updater, or there is no telling where I could have been stuck.

After patching it, one needs to rerun

sudo apt -y dist-upgrade

so the postinst script is actually correctly run.

This is a major bug for an LTS release.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: grub-efi-amd64 2.02~beta2-36ubuntu3.10
ProcVersionSignature: Ubuntu 4.4.0-79.100-generic 4.4.67
Uname: Linux 4.4.0-79-generic x86_64
NonfreeKernelModules: wl nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
CurrentDesktop: Unity
Date: Sat May 20 12:20:02 2017
InstallationDate: Installed on 2016-05-23 (361 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
Ankit Pati (ankitpati) wrote :
description: updated
Ankit Pati (ankitpati)
description: updated
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "This file has just a single semicolon more than the original shipped with the latest update." seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags: added: patch
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in grub2 (Ubuntu):
status: New → Confirmed
Revision history for this message
Mark Shuttleworth (sabdfl) wrote :

Confirmed on multiple machines with -proposed enabled. Please ensure we address before that moves to -updates.

Changed in grub2 (Ubuntu):
importance: Undecided → Critical
Revision history for this message
Simon Déziel (sdeziel) wrote :

I can confirm that the new -proposed package (2.02~beta2-36ubuntu3.11) doesn't have the issue.

Revision history for this message
Steve Langasek (vorlon) wrote :

Sorry for missing this. A new version of grub2 has been uploaded to xenial-proposed that fixes the postinst bug, and has now been published.

Changed in grub2 (Ubuntu):
status: Confirmed → Fix Released
Revision history for this message
Mark Shuttleworth (sabdfl) wrote : Re: [Bug 1692181] Re: bash syntax error in the postinst script

Phew, thanks. Confirmed fixed on all machines.


Revision history for this message
Ankit Pati (ankitpati) wrote :

Thank you for the really prompt response.

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