[Bug 1993478] Re: package openssh-server 1:9.0p1-1ubuntu7 failed to install/upgrade: postinstall script returned 1

[msaxl]

@crhis34 actually socket activated ssh is not that difficult to setup.
The issue for me is only that the upgrade of the configuration did not
work quite right (and I think it is really challenging to do that right)

but simply put you take the file
/etc/systemd/system/ssh.socket.d/addresses.conf

and write something like
[Socket]
ListenStream=
ListenStream=4444

(note the empty ListenStream=, that one is required to not listen on port 22)
followed by a systemctl daemon-reload

then if there is no /etc/systemd/system/ssh.service.d created by the upgrade script then what I did was
systemctl enable ssh.socket && systemctl disable --now ssh.service && systemctl start ssh.socket

an alternative might be doing that what the update script does:
override_dir=/etc/systemd/system/ssh.service.d
mkdir -p "$override_dir"
echo '[Unit]' > "$override_dir"/00-socket.conf
echo 'After=ssh.socket' >> "$override_dir"/00-socket.conf
echo 'Requires=ssh.socket' >> "$override_dir"/00-socket.conf

# deb-systemd-helper is inadequate for the task of
# changing policy for the units on upgrade
if [ -d /run/systemd/system ]; then
       systemctl daemon-reload
       systemctl disable ssh.service
       systemctl unmask ssh.service
       systemctl stop ssh.service
       systemctl enable ssh.socket
fi

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Title:
  package openssh-server 1:9.0p1-1ubuntu7 failed to install/upgrade:
  postinstall script returned 1

Status in openssh package in Ubuntu:
  Triaged

Bug description:
  update failed...

  ProblemType: Package
  DistroRelease: Ubuntu 22.10
  Package: openssh-server 1:9.0p1-1ubuntu7
  ProcVersionSignature: Ubuntu 5.15.0-48.54-generic 5.15.53
  Uname: Linux 5.15.0-48-generic x86_64
  NonfreeKernelModules: cpuid tcp_diag inet_diag tls authenc echainiv esp4 xfrm_user xfrm_algo sctp ip6_udp_tunnel udp_tunnel cfg80211 veth nft_chain_nat xt_REDIRECT nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_tcpudp nft_counter xt_policy nft_compat nf_tables nfnetlink bridge stp llc nls_iso8859_1 hid_generic joydev crct10dif_pclmul crc32_pclmul ghash_clmulni_intel usbhid virtio_net net_failover hid failover i2c_piix4 pata_acpi qemu_fw_cfg floppy sch_fq_codel ipmi_devintf ipmi_msghandler msr ramoops reed_solomon pstore_blk efi_pstore pstore_zone ip_tables x_tables autofs4 btrfs blake2b_generic zstd_compress dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx libcrc32c xor raid6_pq raid1 raid0 multipath linear bochs drm_vram_helper drm_ttm_helper ttm drm_kms_helper syscopyarea aesni_intel sysfillrect sysimgblt input_leds fb_sys_fops cec crypto_simd rc_core psmouse cryptd drm serio_raw virtio_scsi mac_hid
  ApportVersion: 2.23.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Wed Oct 19 08:41:28 2022
  ErrorMessage: »installiertes post-installation-Skript des Paketes openssh-server«-Unterprozess gab den Fehlerwert 1 zurück
  InstallationDate: Installed on 2019-08-13 (1162 days ago)
  InstallationMedia: Ubuntu-Server 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  Python3Details: /usr/bin/python3.10, Python 3.10.7, python3-minimal, 3.10.6-1
  PythonDetails: N/A
  RebootRequiredPkgs: Error: path contained symlinks.
  RelatedPackageVersions:
   dpkg 1.21.9ubuntu1
   apt  2.5.3
  SourcePackage: openssh
  Title: package openssh-server 1:9.0p1-1ubuntu7 failed to install/upgrade: »installiertes post-installation-Skript des Paketes openssh-server«-Unterprozess gab den Fehlerwert 1 zurück
  UpgradeStatus: Upgraded to kinetic on 2022-10-19 (0 days ago)

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