[Bug 877514] [NEW] crashes if no ipstables is installed and upgraded over ssh

[Michael Vogt]

Public bug reported:

If there is no iptables installed and the system is upgraded via ssh it
crashes.

To reproduce:
1. install openssh-server and remove iptables
2. log into localhost 
3. run do-release-upgrade
4. verify the crash
5. run do-release-upgrade --proposed
6. verify that it works

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: In Progress

** Affects: update-manager (Ubuntu Oneiric)
     Importance: Undecided
         Status: In Progress

** Also affects: update-manager (Ubuntu Oneiric)
   Importance: Undecided
       Status: New

** Changed in: update-manager (Ubuntu)
       Status: New => In Progress

** Changed in: update-manager (Ubuntu Oneiric)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/877514

Title:
  crashes if no ipstables is installed and upgraded over ssh

Status in “update-manager” package in Ubuntu:
  In Progress
Status in “update-manager” source package in Oneiric:
  In Progress

Bug description:
  If there is no iptables installed and the system is upgraded via ssh
  it crashes.

  To reproduce:
  1. install openssh-server and remove iptables
  2. log into localhost 
  3. run do-release-upgrade
  4. verify the crash
  5. run do-release-upgrade --proposed
  6. verify that it works

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