Deploying on Debian 12 fails while installing deltachat-core because of missing libunwind8 dependency

[link2xt]

I have created a new aarch64 Debian 12 VPS on Hetzner and tried to install current main (1170adc).

Installation failed at this step:

--> Starting operation: Install Postfix
    [c2.testrun.org] Success

--> Starting operation: Download dovecot-core
    [c2.testrun.org] Success

--> Starting operation: Install dovecot-core
    [c2.testrun.org] dpkg: warning: downgrading dovecot-core from 1:2.3.21.1+dfsg1-1~bpo12+1 to 1:2.3.21+dfsg1-3
    [c2.testrun.org] (Reading database ... 37206 files and directories currently installed.)
    [c2.testrun.org] Preparing to unpack .../dovecot-core_2.3.21%2Bdfsg1-3_arm64.deb ...
    [c2.testrun.org] Unpacking dovecot-core (1:2.3.21+dfsg1-3) over (1:2.3.21.1+dfsg1-1~bpo12+1) ...
    [c2.testrun.org] dpkg: dependency problems prevent configuration of dovecot-core:
    [c2.testrun.org]  dovecot-core depends on libunwind8; however:
    [c2.testrun.org]   Package libunwind8 is not installed.
    [c2.testrun.org]
    [c2.testrun.org] dpkg: error processing package dovecot-core (--install):
    [c2.testrun.org]  dependency problems - leaving unconfigured
    [c2.testrun.org] Processing triggers for man-db (2.11.2-2) ...
    [c2.testrun.org] Errors were encountered while processing:
    [c2.testrun.org]  dovecot-core
    [c2.testrun.org] Error: executed 2 commands

I don't understand where 2.3.21.1+dfsg1-1~bpo12+1 comes from, it was a fresh server.
2.3.19.1+dfsg1-2.1+deb12u1 is the version in the repositories show by apt show dovecot-core.

/etc/debian_version is 12.12.

[link2xt]

I have then uninstalled dovecot-core, rebooted the server (otherwise

relay/cmdeploy/src/cmdeploy/__init__.py

Line 745 in 1170adc

if not "dovecot.service" in host.get_fact(SystemdEnabled):

returns True because "dovecot.service" is there in systemd, just in the failed state and the value in the returned dictionary is False but the key is there), installed libunwind8 and setup succeeded.

[link2xt]

As a simple workaround we can install libunwind8 manually. But ideally we need to install a .deb package with its dependencies.

[decibyte]

I ran into the same issue. Can confirm that a manual apt install libunwind8 fixed the problem.