[Bug 2073877] [NEW] [Regression] Unable to install mysql-server-8.0 with Ubuntu 24.04

[lgourvenec]

Public bug reported:

With Ubuntu ISO 24.04 and an autoinstall file with :
=====
  packages:
    - mysql-server-8.0
=====
or
=====
  late-commands:
    - curtin in-target --target=/target -- bash -c 'apt-get install -yf mysql-server-8.0'
=====

the installation fails. What happens :
during the execution of the postinst script, the function "stop_server" fails to detect that mysqld is stopped because the test line ~60 "if ! $(ps $server_pid >/dev/null 2>&1); then" doesn't detect that the server is in a defunct state... The parent process of mysqld is apt-get.
Oddly, this bug didn't occur with Ubuntu 22.04 (the postinst script doesn't seem to have changed).
Having no problem installing mysql-server-8.0 with apt-get on an installed server, I guess the problem comes from curtin or subiquity.

** Affects: curtin
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2073877

Title:
  [Regression] Unable to install mysql-server-8.0 with Ubuntu 24.04

Status in curtin:
  New

Bug description:
  With Ubuntu ISO 24.04 and an autoinstall file with :
  =====
    packages:
      - mysql-server-8.0
  =====
  or
  =====
    late-commands:
      - curtin in-target --target=/target -- bash -c 'apt-get install -yf mysql-server-8.0'
  =====

  the installation fails. What happens :
  during the execution of the postinst script, the function "stop_server" fails to detect that mysqld is stopped because the test line ~60 "if ! $(ps $server_pid >/dev/null 2>&1); then" doesn't detect that the server is in a defunct state... The parent process of mysqld is apt-get.
  Oddly, this bug didn't occur with Ubuntu 22.04 (the postinst script doesn't seem to have changed).
  Having no problem installing mysql-server-8.0 with apt-get on an installed server, I guess the problem comes from curtin or subiquity.

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