[Bug 2129710] [NEW] release upgrader should warn about 3rd party libs overrides

[Simon Poirier]

Public bug reported:

Ubuntu release upgrader should warn about 3rd party libs overrides, as
the upgrade could be break a system through stray libs.

e.g.

cp /usr/lib/x86_64-linux-gnu/libc.so.6 /usr/local/lib/
do-release-upgrade  -d
...
Setting up libc-bin (2.42-0ubuntu3) ...
/usr/bin/dpkg: symbol lookup error: /usr/local/lib/libc.so.6: undefined symbol: __nptl_change_stack_perm, version GLIBC_PRIVATE
/usr/bin/dpkg: symbol lookup error: /usr/local/lib/libc.so.6: undefined symbol: __nptl_change_stack_perm, version GLIBC_PRIVATE
sh: symbol lookup error: /usr/local/lib/libc.so.6: undefined symbol: __nptl_change_stack_perm, version GLIBC_PRIVATE


To add to the confusion, in the above example, the system would be left unusable and hard to fix (coreutils is also broken).
I think it would be good to warn users on upgrade if some unsupported libs are present in usr/local (even better if we can warn only about conflicting libs) to prevent bricking the system.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2129710

Title:
  release upgrader should warn about 3rd party libs overrides

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Ubuntu release upgrader should warn about 3rd party libs overrides, as
  the upgrade could be break a system through stray libs.

  e.g.

  cp /usr/lib/x86_64-linux-gnu/libc.so.6 /usr/local/lib/
  do-release-upgrade  -d
  ...
  Setting up libc-bin (2.42-0ubuntu3) ...
  /usr/bin/dpkg: symbol lookup error: /usr/local/lib/libc.so.6: undefined symbol: __nptl_change_stack_perm, version GLIBC_PRIVATE
  /usr/bin/dpkg: symbol lookup error: /usr/local/lib/libc.so.6: undefined symbol: __nptl_change_stack_perm, version GLIBC_PRIVATE
  sh: symbol lookup error: /usr/local/lib/libc.so.6: undefined symbol: __nptl_change_stack_perm, version GLIBC_PRIVATE

  
  To add to the confusion, in the above example, the system would be left unusable and hard to fix (coreutils is also broken).
  I think it would be good to warn users on upgrade if some unsupported libs are present in usr/local (even better if we can warn only about conflicting libs) to prevent bricking the system.

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