** Tags removed: verification-needed

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https://bugs.launchpad.net/bugs/1838245

Title:
  dkms script is missing function find_module

Status in DKMS:
  Fix Released
Status in dkms package in Ubuntu:
  Fix Released
Status in dkms source package in Bionic:
  Fix Released
Status in dkms source package in Disco:
  Fix Released
Status in dkms source package in Eoan:
  Fix Released
Status in dkms source package in Focal:
  Fix Released

Bug description:
  
  update for SRU process:
  [Impact]
  1. dkms script is missing function find_module
  2. priority of OBSOLETE_BY should higher than "force". #89  
https://github.com/dell/dkms/issues/89

  [Test case]
  install the dkms which already patched (also can be found in my ppa[1])
  1. install a dkms which for a kernel module system already installed.
  e.g. ath10k of my testing ppa : [1] 
  1.1. the dkms can be installed well.

  2. install a dkms which has OBSOLETE_BY and FORCE
  e.g.ath10k of my testing ppa : [1] (source code in [2])
   - the target dkms defined OBSOLETE_BY and FORCE
   - user install dkms on a system which installed kernel version less than 
OBSOLETE_BY and another kernel higher than OBSOLETE_BY
   - the dkms can be installed well.

  [Regression potential]
  medium as it touched the version sanity. This change correct the code logic 
and land one more change from upstream as well.
  The logic has been verified by #5 and me.

  ------------------------------------------------------------------------
  Building a kernel module using dkms in Linux Mint 19.1 shows the following 
error:

  Running module version sanity check.
  /usr/sbin/dkms: Zeile 784: find_module: Befehl nicht gefunden
  modinfo: ERROR: missing module or filename.

  Checking the file the function is indeed missing and another user
  confirmed, that it was removed at some point:
  https://github.com/linuxmint/linuxmint/issues/142

  Possible solution: Readd

  find_module()
  {
      # tree = $1
      # module = $2
      find "$1" -name "$2$module_uncompressed_suffix" -o -name 
"$2$module_suffix" -type f
      return $?
  }

  as found in https://github.com/dell/dkms/blob/master/dkms

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