[Bug 1583691] [NEW] grub-probe: When a device has been specified WITHOUT option '-d', grub-probe should display an additional user-friendly advice message

[Etienne URBAH]

Public bug reported:

When a device has been specified to 'grub-probe' WITHOUT option '-d', 'grub-probe' systematically displays following error message :
grub-probe: error: failed to get canonical path of `udev'.

This error message is logical when considering the internal point of
view of 'grub-probe', but it is NOT user-friendly.

Therefore, I suggest that 'grub-probe' displays an additional user-friendly advice message like the following one :
grub-probe: advice: specifying a device requires option '-d'.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: grub-common 2.02~beta2-36ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Thu May 19 17:23:33 2016
InstallationDate: Installed on 2014-11-03 (562 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: grub2
UpgradeStatus: Upgraded to xenial on 2016-05-09 (9 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1583691

Title:
  grub-probe: When a device has been specified WITHOUT option '-d',
  grub-probe should display an additional user-friendly advice message

Status in grub2 package in Ubuntu:
  New

Bug description:
  When a device has been specified to 'grub-probe' WITHOUT option '-d', 'grub-probe' systematically displays following error message :
  grub-probe: error: failed to get canonical path of `udev'.

  This error message is logical when considering the internal point of
  view of 'grub-probe', but it is NOT user-friendly.

  Therefore, I suggest that 'grub-probe' displays an additional user-friendly advice message like the following one :
  grub-probe: advice: specifying a device requires option '-d'.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: grub-common 2.02~beta2-36ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: X-Cinnamon
  Date: Thu May 19 17:23:33 2016
  InstallationDate: Installed on 2014-11-03 (562 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to xenial on 2016-05-09 (9 days ago)

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