[Bug 1822261] [NEW] Upgrade of procps disables net.ipv4.ip_forward=1

[Jonathan Kaulard]

Public bug reported:

Expected behavior:
Settings in /etc/sysctl.conf won't be changed by an upgrade or there will be a prompt if the original file should be overwritten.

What happened:
After performing an upgrade of package procps IPv4Forwarding was disabled in /etc/sysctl.conf without asking:

# Uncomment the next line to enable packet forwarding for IPv4
#net.ipv4.ip_forward=1

I was able to reproduce this behavior by using unattended-upgrades and
also by upgrading manually (apt-get upgrade)

My system:

lsb_release -rd
Description:    Ubuntu 18.04.2 LTS
Release:        18.04

apt-cache policy procps
procps:
  Installed: 2:3.3.12-3ubuntu1.1
  Candidate: 2:3.3.12-3ubuntu1.1
  Version table:
 *** 2:3.3.12-3ubuntu1.1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2:3.3.12-3ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

** Affects: procps (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Description changed:

  Expected behavior:
  Settings in /etc/sysctl.conf won't be changed by an upgrade or there will be a prompt if the original file should be overwritten.
  
  What happened:
  After performing an upgrade of package procps IPv4Forwarding was disabled in /etc/sysctl.conf without asking:
  
  # Uncomment the next line to enable packet forwarding for IPv4
- net.ipv4.ip_forward=1
+ #net.ipv4.ip_forward=1
  
  I was able to reproduce this behavior by using unattended-upgrades and
  also by upgrading manually (apt-get upgrade)
  
  My system:
  
  lsb_release -rd
  Description:    Ubuntu 18.04.2 LTS
  Release:        18.04
  
  apt-cache policy procps
  procps:
-   Installed: 2:3.3.12-3ubuntu1.1
-   Candidate: 2:3.3.12-3ubuntu1.1
-   Version table:
-  *** 2:3.3.12-3ubuntu1.1 500
-         500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
-         500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
-         100 /var/lib/dpkg/status
-      2:3.3.12-3ubuntu1 500
-         500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+   Installed: 2:3.3.12-3ubuntu1.1
+   Candidate: 2:3.3.12-3ubuntu1.1
+   Version table:
+  *** 2:3.3.12-3ubuntu1.1 500
+         500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
+         500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
+         100 /var/lib/dpkg/status
+      2:3.3.12-3ubuntu1 500
+         500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

-- 
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https://bugs.launchpad.net/bugs/1822261

Title:
  Upgrade of procps disables net.ipv4.ip_forward=1

Status in procps package in Ubuntu:
  Confirmed

Bug description:
  Expected behavior:
  Settings in /etc/sysctl.conf won't be changed by an upgrade or there will be a prompt if the original file should be overwritten.

  What happened:
  After performing an upgrade of package procps IPv4Forwarding was disabled in /etc/sysctl.conf without asking:

  # Uncomment the next line to enable packet forwarding for IPv4
  #net.ipv4.ip_forward=1

  I was able to reproduce this behavior by using unattended-upgrades and
  also by upgrading manually (apt-get upgrade)

  My system:

  lsb_release -rd
  Description:    Ubuntu 18.04.2 LTS
  Release:        18.04

  apt-cache policy procps
  procps:
    Installed: 2:3.3.12-3ubuntu1.1
    Candidate: 2:3.3.12-3ubuntu1.1
    Version table:
   *** 2:3.3.12-3ubuntu1.1 500
          500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
          100 /var/lib/dpkg/status
       2:3.3.12-3ubuntu1 500
          500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

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