[Bug 2019961] [NEW] [Upgrade from openjdk-11 to openjdk-17] update-binfmts: warning: current package is openjdk-17, but binary format already installed by openjdk-11

[fprietog]

Public bug reported:

Summary:
--------
There is a warning when upgrading from Ubuntu 22.10 (openjdk-11) to Ubuntu 23.04 (openjdk-17):

update-binfmts: warning: current package is openjdk-17, but binary
format already installed by openjdk-11

It happens only if you have the package binfmt-support installed and
you're upgrading the package openjdk-17-jre-headless from it's
openjdk-11 counterpart.

There is the info shown by update-binfmts command:

# update-binfmts --display
jar (enabled):
     package = openjdk-11
        type = magic
      offset = 0
       magic = PK\x03\x04
        mask = 
 interpreter = /usr/bin/jexec
    detector = 


Workaround:
-----------
This workaround is not necessary because it still works for openjdk-17, but it avoid the warning every time openjdk is upgraded again:

- Remove the openjdk-11 entry using this command:
# update-binfmts --package openjdk-11 --remove jar /usr/bin/jexec

- Reinstall the package "openjdk-17-jre-headless". Now the update-
binfmts command will shown the info updated to openjdk-17:

# update-binfmts --display
jar (enabled):
     package = openjdk-17
        type = magic
      offset = 0
       magic = PK\x03\x04
        mask = 
 interpreter = /usr/bin/jexec
    detector =

** Affects: openjdk-17 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: binfmt-support lunar openjdk-17 update-binfmts

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https://bugs.launchpad.net/bugs/2019961

Title:
  [Upgrade from openjdk-11 to openjdk-17] update-binfmts: warning:
  current package is openjdk-17, but binary format already installed by
  openjdk-11

Status in openjdk-17 package in Ubuntu:
  New

Bug description:
  Summary:
  --------
  There is a warning when upgrading from Ubuntu 22.10 (openjdk-11) to Ubuntu 23.04 (openjdk-17):

  update-binfmts: warning: current package is openjdk-17, but binary
  format already installed by openjdk-11

  It happens only if you have the package binfmt-support installed and
  you're upgrading the package openjdk-17-jre-headless from it's
  openjdk-11 counterpart.

  There is the info shown by update-binfmts command:

  # update-binfmts --display
  jar (enabled):
       package = openjdk-11
          type = magic
        offset = 0
         magic = PK\x03\x04
          mask = 
   interpreter = /usr/bin/jexec
      detector = 

  
  Workaround:
  -----------
  This workaround is not necessary because it still works for openjdk-17, but it avoid the warning every time openjdk is upgraded again:

  - Remove the openjdk-11 entry using this command:
  # update-binfmts --package openjdk-11 --remove jar /usr/bin/jexec

  - Reinstall the package "openjdk-17-jre-headless". Now the update-
  binfmts command will shown the info updated to openjdk-17:

  # update-binfmts --display
  jar (enabled):
       package = openjdk-17
          type = magic
        offset = 0
         magic = PK\x03\x04
          mask = 
   interpreter = /usr/bin/jexec
      detector =

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