[Bug 2142922] [NEW] apt why results in Segmentation fault in InternalCliWhy on Ubuntu 25.10 (Questing Quokka)

[Lê Anh Đức]

Public bug reported:

[Summary]
Running 'apt why' on a non-existent or legacy package name causes a segmentation fault in APT version 3.1.6ubuntu2 on Ubuntu 25.10 (Questing Quokka).

[Steps to reproduce]
1. Open terminal on Ubuntu 25.10.
2. Run command: apt why libasound2
(Note: libasound2 is a legacy package name, replaced by libasound2t64 in this release).

[Expected result]
APT should report that the package cannot be found or provide dependency information without crashing.

[Actual result]
Segmentation fault (core dumped).

[Technical Details]
- OS: Ubuntu 25.10 (Questing Quokka)
- APT version: 3.1.6ubuntu2
- Stack trace points to: APT::Solver::InternalCliWhy in libapt-pkg.so.7.0
- Querying the new package name 'libasound2t64' works as expected, but the legacy name triggers the crash.

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: apt 3.1.6ubuntu2
Uname: Linux 6.19.4-x64v2-xanmod1 x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: LXQt
Date: Sat Feb 28 09:10:06 2026
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug questing

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https://bugs.launchpad.net/bugs/2142922

Title:
  apt why results in Segmentation fault in InternalCliWhy on Ubuntu
  25.10 (Questing Quokka)

Status in apt package in Ubuntu:
  New

Bug description:
  [Summary]
  Running 'apt why' on a non-existent or legacy package name causes a segmentation fault in APT version 3.1.6ubuntu2 on Ubuntu 25.10 (Questing Quokka).

  [Steps to reproduce]
  1. Open terminal on Ubuntu 25.10.
  2. Run command: apt why libasound2
  (Note: libasound2 is a legacy package name, replaced by libasound2t64 in this release).

  [Expected result]
  APT should report that the package cannot be found or provide dependency information without crashing.

  [Actual result]
  Segmentation fault (core dumped).

  [Technical Details]
  - OS: Ubuntu 25.10 (Questing Quokka)
  - APT version: 3.1.6ubuntu2
  - Stack trace points to: APT::Solver::InternalCliWhy in libapt-pkg.so.7.0
  - Querying the new package name 'libasound2t64' works as expected, but the legacy name triggers the crash.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: apt 3.1.6ubuntu2
  Uname: Linux 6.19.4-x64v2-xanmod1 x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: LXQt
  Date: Sat Feb 28 09:10:06 2026
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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