[Pkg-mailman-hackers] Bug#1120648: mailman3-web: Attempt to upgrade mailman-web fails with permissions error

[Peter Chubb]

Package: mailman3-web
Version: 0+20240312-2
Severity: important

Dear Maintainer,

I did an `apt install mailman3-web` to upgrade, and got:
PermissionError: [Errno 13] Permission denied: '/var/lib/mailman3/web/static/postorius/libs/bootstrap/css/bootstrap.css'

$ ls -l /var/lib/mailman3/web/static/postorius/libs/bootstrap/css/
total 0
lrwxrwxrwx 1 root root 50 Aug 21  2024 bootstrap.css -> ../../../../../../bootstrap-html/css/bootstrap.css
lrwxrwxrwx 1 root root 54 Mar 12  2025 bootstrap.min.css -> ../../../../../../bootstrap-html/css/bootstrap.min.css
lrwxrwxrwx 1 root root 58 Mar 12  2025 bootstrap.min.css.map -> ../../../../../../bootstrap-html/css/bootstrap.min.css.map

`bootstrap-html` is from libjs-bootstrap5 I think.

-- System Information:
Debian Release: forky/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.16.3+deb14-cloud-amd64 (SMP w/1 CPU thread; PREEMPT)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages mailman3-web depends on:
ii  dbconfig-sqlite3           2.0.25
ii  debconf [debconf-2.0]      1.5.91
ii  init-system-helpers        1.69
ii  python3                    3.13.7-1
ii  python3-django-hyperkitty  1.3.12-3
ii  python3-django-postorius   1.3.13-1
ii  python3-psycopg2           2.9.10-1+b1
ii  python3-whoosh             2.7.4+git6-g9134ad92-10
ii  ucf                        3.0052
ii  uwsgi-core                 2.0.29-1+b1
ii  uwsgi-plugin-python3       2.0.29+1+0.0.2+b2

Versions of packages mailman3-web recommends:
ii  nginx  1.28.0-3

Versions of packages mailman3-web suggests:
ii  postgresql  17+282

-- debconf information:
  mailman3-web/db/basepath:
* mailman3-web/pgsql/authmethod-admin: ident
  mailman3-web/mysql/method: Unix socket
  mailman3-web/purge: false
  mailman3-web/remote/host: localhost
  mailman3-web/internal/skip-preseed: false
  mailman3-web/internal/reconfiguring: false
  mailman3-web/dbconfig-remove: true
  mailman3-web/mysql/authplugin: default
  mailman3-web/pgsql/manualconf:
* mailman3-web/passwords-do-not-match:
* mailman3-web/superuser-name: seL4
* mailman3-web/db/dbname: mailman3web
  mailman3-web/missing-db-package-error: abort
  mailman3-web/remote/port:
* mailman3-web/configure-webserver: none
  mailman3-web/mysql/admin-user:
  mailman3-web/pgsql/changeconf: false
* mailman3-web/db/app-user: mailman3web at localhost
* mailman3-web/pgsql/method: Unix socket
* mailman3-web/dbconfig-reinstall: true
  mailman3-web/upgrade-error: abort
* mailman3-web/emailname: sel4.systems
  mailman3-web/dbconfig-upgrade: true
* mailman3-web/restart-webserver: true
* mailman3-web/pgsql/authmethod-user: ident
  mailman3-web/install-error: abort
  mailman3-web/remote/newhost:
* mailman3-web/pgsql/admin-user: postgres
  mailman3-web/upgrade-backup: true
* mailman3-web/dbconfig-install: true
  mailman3-web/pgsql/no-empty-passwords:
* mailman3-web/database-type: pgsql
  mailman3-web/remove-error: abort
* mailman3-web/superuser-mail: listadmin at sel4.systems
  mailman3-web/nginx-choice: