Public bug reported:

in Ubuntu Xenial :
$ lsb_release -rdc ; echo 1 1 + p q | dc ; echo $?
Description:    Ubuntu 16.04.4 LTS
Release:        16.04
Codename:       xenial
2
0

in Ubuntu Bionic :
$ lsb_release -rdc ; echo 1 1 + p q | dc ; echo $?
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic
2
1

This change causes some scripts using 'dc' to fail, most importantly,
'dphys-swapfile' which for some ironic reason uses 'dc' instead of 'echo
$((...))' for its calculations.

** Affects: bc (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: dphys-swapfile (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: dphys-swapfile (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1788681

Title:
  changed exit code for 'dc' in Ubuntu Bionic

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