Bug#948710: openssh-server: Fail to upgrade "ssh.service: Unit -.mount is masked"

[Christian Marillat <marillat@debian.org>]

Package: openssh-server
Version: 1:8.1p1-5
Severity: serious

Dear Maintainer,

Fail to upgrade with this error :

Setting up openssh-server (1:8.1p1-5) ...
rescue-ssh.target is a disabled or a static unit, not starting it.
Failed to restart ssh.service: Unit -.mount is masked.
invoke-rc.d: initscript ssh, action "restart" failed.
* ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2020-01-11 08:26:51 CET; 1 day 6h ago
       Docs: man:sshd(8)
             man:sshd_config(5)
   Main PID: 1119 (sshd)
     Memory: 3.7M
     CGroup: /system.slice/ssh.service
             `-1119 /usr/sbin/sshd -D

Christian

-- System Information:
Debian Release: bullseye/sid
  APT prefers buildd-unstable
  APT policy: (500, 'buildd-unstable'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.93 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN, TAINT_OOT_MODULE
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages openssh-server depends on:
ii  adduser                3.118
ii  debconf [debconf-2.0]  1.5.73
ii  dpkg                   1.19.7
ii  libaudit1              1:2.8.5-2+b1
ii  libc6                  2.29-9
ii  libcom-err2            1.45.5-2
ii  libcrypt1              1:4.4.10-10
ii  libgssapi-krb5-2       1.17-6
ii  libkrb5-3              1.17-6
ii  libpam-modules         1.3.1-5
ii  libpam-runtime         1.3.1-5
ii  libpam0g               1.3.1-5
ii  libselinux1            3.0-1
ii  libssl1.1              1.1.1d-2
ii  libsystemd0            244-3
ii  libwrap0               7.6.q-30
ii  lsb-base               11.1.0
ii  openssh-client         1:8.1p1-5
ii  openssh-sftp-server    1:8.1p1-5
ii  procps                 2:3.3.15-2+b1
ii  runit-helper           2.8.14
ii  ucf                    3.0038+nmu1
ii  zlib1g                 1:1.2.11.dfsg-1+b1

Versions of packages openssh-server recommends:
ii  libpam-systemd [logind]  244-3
ii  ncurses-term             6.1+20191019-1
ii  xauth                    1:1.0.10-1

Versions of packages openssh-server suggests:
pn  molly-guard   <none>
pn  monkeysphere  <none>
pn  ssh-askpass   <none>
pn  ufw           <none>

-- debconf information excluded