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https://bugs.launchpad.net/bugs/1854472

Title:
  ubuntu-drivers-common fails when no PATH environment variable is
  passed

Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released
Status in ubuntu-drivers-common source package in Bionic:
  Fix Committed
Status in ubuntu-drivers-common source package in Eoan:
  Fix Released

Bug description:
  SRU Request:

  [Impact]

   * ubuntu-drivers-common fails when no PATH environment variable is
  passed:

  https://errors.ubuntu.com/problem/52d04f39f8cbdb77d65ec57f19a5801284c1e2b0

  
   * While the reasons why the PATH variable is empty are unknown, the 
ubuntu-drivers tools should be more robust and not fail, and we can expect a 
minimal PATH (such as /sbin:/usr/sbin:/bin:/usr/bin) to be available on the 
system.

  
  [Test Case]

   * Install ubuntu-drivers-common from the -proposed repository.

   * Call the ubuntu drivers tool passing the "devices" parameter:
     ubuntu-drivers devices

   * Call the ubuntu drivers tool passing the "devices" parameter and an empty 
PATH variable:
     PATH="" /usr/bin/ubuntu-drivers devices

   * Neither case should fail any more.

  [Regression Potential]

   * Low. Nothing really changes in the functioning if the PATH variable
  is not empty.

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