[Bug 1357926] [NEW] do-release-upgrade cannot be launched from screen

[Sebo]

Public bug reported:

When `do-release-upgrade` is started from a `screen` terminal it ignores
this and runs its own `screen` inside.

I would expect the software to check if it is allready runned inside the
screen and if so just do not start its own.

That would not harm... however the result is that output encoded two times by the `screen` app is unredable and looks just like below:
F␋┌␊ "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/├⎼┤⎽├≤", ┌␋┼␊ 10, ␋┼ <└⎺␍┤┌␊>
⎽≤⎽.␊│␋├(└▒␋┼())

F␋┌␊ "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊M▒␋┼.⎻≤",
┌␋┼␊ 243, ␋┼ └▒␋┼
␋° ▒⎻⎻.⎼┤┼():

F␋┌␊
"/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
┌␋┼␊ 1827, ␋┼ ⎼┤┼
⎼␊├┤⎼┼ ⎽␊┌°.°┤┌┌U⎻±⎼▒␍␊()

F␋┌␊
"/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
┌␋┼␊ 1649, ␋┼ °┤┌┌U⎻±⎼▒␍␊
␋° ┼⎺├ ⎽␊┌°.⎻⎼␊⎻▒⎼␊():

F␋┌␊
"/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
┌␋┼␊ 441, ␋┼ ⎻⎼␊⎻▒⎼␊
⎽␊┌°.▮⎽⎽␤M▒±␋␌()

F␋┌␊
"/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
┌␋┼␊ 311, ␋┼ ▮⎽⎽␤M▒±␋␌
"D⎺ ≤⎺┤ ┬▒┼├ ├⎺ ␌⎺┼├␋┼┤␊?") % ⎻⎺⎼├)

F␋┌␊ "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊V␋␊┬T␊│├.⎻≤",
┌␋┼␊ 222, ␋┼ ▒⎽┐Y␊⎽N⎺Q┤␊⎽├␋⎺┼
⎼␊⎽ = ⎽≤⎽.⎽├␍␋┼.⎼␊▒␍┌␋┼␊().␍␊␌⎺␍␊(ENCODING, "␉▒␌┐⎽┌▒⎽␤⎼␊⎻┌▒␌␊"


It occured while over `ssh` upgrade from 12.04.5 LTS to 14.04.1 LTS so to reproduce:
1) `ssh to-ubuntu-precise-host`
2) `screen`
3) `sudo do-release-upgrade`

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1357926

Title:
  do-release-upgrade cannot be launched from screen

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  When `do-release-upgrade` is started from a `screen` terminal it
  ignores this and runs its own `screen` inside.

  I would expect the software to check if it is allready runned inside
  the screen and if so just do not start its own.

  That would not harm... however the result is that output encoded two times by the `screen` app is unredable and looks just like below:
  F␋┌␊ "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/├⎼┤⎽├≤", ┌␋┼␊ 10, ␋┼ <└⎺␍┤┌␊>
  ⎽≤⎽.␊│␋├(└▒␋┼())

  F␋┌␊ "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊M▒␋┼.⎻≤",
  ┌␋┼␊ 243, ␋┼ └▒␋┼
  ␋° ▒⎻⎻.⎼┤┼():

  F␋┌␊
  "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
  ┌␋┼␊ 1827, ␋┼ ⎼┤┼
  ⎼␊├┤⎼┼ ⎽␊┌°.°┤┌┌U⎻±⎼▒␍␊()

  F␋┌␊
  "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
  ┌␋┼␊ 1649, ␋┼ °┤┌┌U⎻±⎼▒␍␊
  ␋° ┼⎺├ ⎽␊┌°.⎻⎼␊⎻▒⎼␊():

  F␋┌␊
  "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
  ┌␋┼␊ 441, ␋┼ ⎻⎼␊⎻▒⎼␊
  ⎽␊┌°.▮⎽⎽␤M▒±␋␌()

  F␋┌␊
  "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊C⎺┼├⎼⎺┌┌␊⎼.⎻≤",
  ┌␋┼␊ 311, ␋┼ ▮⎽⎽␤M▒±␋␌
  "D⎺ ≤⎺┤ ┬▒┼├ ├⎺ ␌⎺┼├␋┼┤␊?") % ⎻⎺⎼├)

  F␋┌␊ "/├└⎻/┤⎻␍▒├␊-└▒┼▒±␊⎼-␋X▮V⎼8/D␋⎽├U⎻±⎼▒␍␊/D␋⎽├U⎻±⎼▒␍␊V␋␊┬T␊│├.⎻≤",
  ┌␋┼␊ 222, ␋┼ ▒⎽┐Y␊⎽N⎺Q┤␊⎽├␋⎺┼
  ⎼␊⎽ = ⎽≤⎽.⎽├␍␋┼.⎼␊▒␍┌␋┼␊().␍␊␌⎺␍␊(ENCODING, "␉▒␌┐⎽┌▒⎽␤⎼␊⎻┌▒␌␊"

  
  It occured while over `ssh` upgrade from 12.04.5 LTS to 14.04.1 LTS so to reproduce:
  1) `ssh to-ubuntu-precise-host`
  2) `screen`
  3) `sudo do-release-upgrade`

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