Public bug reported:

== Justification ==
Issue found in Disco, the ftrace test will complain about:
    ./ftracetest: 163: [: Illegal number:

This is because the tput command fails and returns nothing for the shell
script comparison.

== Fix ==
* 0e27ded1 (selftests/ftrace: Handle the absence of tput)
Prerequisite:
* 4ce55a9c (selftests/ftrace: Replace \e with \033

Patch 4ce55a9c is needed to make this a clean cherry-pick.
As it's fixing the color escape code, it is safe to pull this in.

These patches can be cherry-picked into Disco and Eoan.

== Test ==
Problem can be solved with this patch.

== Regression Potential ==
No regression is expected. It's just fixing the testing tool.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Po-Hsu Lin (cypressyew)
         Status: In Progress

** Affects: linux (Ubuntu Disco)
     Importance: Undecided
     Assignee: Po-Hsu Lin (cypressyew)
         Status: In Progress

** Affects: linux (Ubuntu Eoan)
     Importance: Undecided
     Assignee: Po-Hsu Lin (cypressyew)
         Status: In Progress

** Also affects: linux (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Eoan)
       Status: New => In Progress

** Changed in: linux (Ubuntu Disco)
       Status: New => In Progress

** Changed in: linux (Ubuntu Disco)
     Assignee: (unassigned) => Po-Hsu Lin (cypressyew)

** Changed in: linux (Ubuntu Eoan)
     Assignee: (unassigned) => Po-Hsu Lin (cypressyew)

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https://bugs.launchpad.net/bugs/1828989

Title:
  ftrace in ubuntu_kernel_selftests complains "Illegal number" because
  of the absence of tput

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Disco:
  In Progress
Status in linux source package in Eoan:
  In Progress

Bug description:
  == Justification ==
  Issue found in Disco, the ftrace test will complain about:
      ./ftracetest: 163: [: Illegal number:

  This is because the tput command fails and returns nothing for the
  shell script comparison.

  == Fix ==
  * 0e27ded1 (selftests/ftrace: Handle the absence of tput)
  Prerequisite:
  * 4ce55a9c (selftests/ftrace: Replace \e with \033

  Patch 4ce55a9c is needed to make this a clean cherry-pick.
  As it's fixing the color escape code, it is safe to pull this in.

  These patches can be cherry-picked into Disco and Eoan.

  == Test ==
  Problem can be solved with this patch.

  == Regression Potential ==
  No regression is expected. It's just fixing the testing tool.

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