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[Lukas <2127106@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After upgrading to Ubuntu 25.10 (Questing), the stty command seems to return an invalid or non-standard argument format.
This causes many interactive terminal applications (for example, Symfony Console) to fail when they attempt to change terminal settings.

Example when running a Symfony command: php bin/console make:entity

Class name of the entity to create or update (e.g. GrumpyKangaroo):
 > User
stty: invalid argument '500:5:f00bf:8a3b:3:1c:7f:15:4:0:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0'


At this point, the terminal often stops showing what you type (echo is lost), and the only way to fix it is to run stty sane.

Steps to reproduce

Run on Ubuntu 25.10:
stty -g
Output example: 500:5:f00bf:8a3b:3:1c:7f:15:4:0:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0

php bin/console make:entity
stty: invalid argument '500:5:f00bf:8a3b:...'
Input visibility is lost — typed text does not appear.

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


** Tags: coreutils php regression symfony terminal tty ubuntu-25.10

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https://bugs.launchpad.net/bugs/2127106

Title:
  stty: invalid argument in Ubuntu 25.10 breaks Symfony Console and
  other CLI tools

Status in coreutils package in Ubuntu:
  New

Bug description:
  After upgrading to Ubuntu 25.10 (Questing), the stty command seems to return an invalid or non-standard argument format.
  This causes many interactive terminal applications (for example, Symfony Console) to fail when they attempt to change terminal settings.

  Example when running a Symfony command: php bin/console make:entity

  Class name of the entity to create or update (e.g. GrumpyKangaroo):
   > User
  stty: invalid argument '500:5:f00bf:8a3b:3:1c:7f:15:4:0:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0'

  
  At this point, the terminal often stops showing what you type (echo is lost), and the only way to fix it is to run stty sane.

  Steps to reproduce

  Run on Ubuntu 25.10:
  stty -g
  Output example: 500:5:f00bf:8a3b:3:1c:7f:15:4:0:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0

  php bin/console make:entity
  stty: invalid argument '500:5:f00bf:8a3b:...'
  Input visibility is lost — typed text does not appear.

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