[Bug 1694989] [NEW] apt-mark overwrites existing held package info

[Matthew North]

Public bug reported:

Running apt-mark hold commands overwrites / nullifies any existing held
package data. Not sure if this is by design, but I assume it's meant to
be cumulative.

Ubuntu version: 16.04.2 LTS
Package version: apt 1.2.19 amd64

Expected behaviour:

apt-mark hold 3dchess
apt-mark hold 0ad
apt-mark showhold

3dchess
0ad

Actual behaviour:

apt-mark hold 3dchess
apt-mark hold 0ad
apt-mark showhold

0ad

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

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https://bugs.launchpad.net/bugs/1694989

Title:
  apt-mark overwrites existing held package info

Status in apt package in Ubuntu:
  New

Bug description:
  Running apt-mark hold commands overwrites / nullifies any existing
  held package data. Not sure if this is by design, but I assume it's
  meant to be cumulative.

  Ubuntu version: 16.04.2 LTS
  Package version: apt 1.2.19 amd64

  Expected behaviour:

  apt-mark hold 3dchess
  apt-mark hold 0ad
  apt-mark showhold

  3dchess
  0ad

  Actual behaviour:

  apt-mark hold 3dchess
  apt-mark hold 0ad
  apt-mark showhold

  0ad

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