Ubuntu服务器中Unattended-upgrades配置ZeroTier源规则失败的问题求助

最近在搭建Ubuntu服务器的时候，我像往常一样安装了ZeroTier，同时配置了unattended-upgrades自动升级工具。但ZeroTier在自动升级这块一直是个麻烦家伙——它的源信息里全是重复的发行版名称，我查到的源详情如下：

500 http://download.zerotier.com/debian/mantic mantic/main amd64 Packages

release o=mantic mantic,a=mantic,n=mantic,l=mantic mantic,c=main,b=amd64

origin download.zerotier.com

Origin: mantic mantic

Label: mantic mantic

Suite: mantic

Codename: mantic

Date: Mon, 30 Oct 2023 18:45:47 UTC

Architectures: amd64 arm64 armhf i386 ppc64el s390x

Components: main

Description: Generated by aptly

这些信息显然没什么实际参考价值。之前在所有Debian机器上，我在50unattended-upgrades配置文件里用下面这条规则一直都能正常工作：

"site=download.zerotier.com,n=${distro_codename}";

虽然这条规则不算完美，但至少能让ZeroTier的包正常自动升级。可到了这台Ubuntu服务器上，这条规则直接导致unattended-upgrades崩溃，报错信息如下：

Traceback (most recent call last):

File "/usr/bin/unattended-upgrades", line 2522, in <module>

sys.exit(main(options))

^^^^^^^^^^^^^

File "/usr/bin/unattended-upgrades", line 1993, in main

res = run(options, rootdir, mem_log, logfile_dpkg,

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/usr/bin/unattended-upgrades", line 2134, in run

cache = UnattendedUpgradesCache(rootdir=rootdir)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/usr/bin/unattended-upgrades", line 156, in __init__

self.allowed_origins = get_allowed_origins()

^^^^^^^^^^^^^^^^^^^^^

File "/usr/bin/unattended-upgrades", line 793, in get_allowed_origins

allowed_origins = get_allowed_origins_legacy()

^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/usr/bin/unattended-upgrades", line 772, in get_allowed_origins_legacy

(distro_id, distro_codename) = s.split()

^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ValueError: not enough values to unpack (expected 2, got 1)

这真的让我很意外，我完全没想到Ubuntu和Debian的unattended-upgrades差异会这么大，居然会因为这条规则直接报错。后来我把这条源规则注释掉之后，unattended-upgrades就又能正常运行了，所以问题肯定出在这条规则上。

想请教各位，结合我上面给出的ZeroTier源信息，有没有什么办法能解决这个规则失效的问题？

备注：内容来源于stack exchange，提问作者Decoherent