Ubuntu 20.04升级至22.04后Apache及Phusion Passenger关联Web应用故障排查请求

大家好，最近我在把Ubuntu 20.04升级到22.04的过程中踩了不少坑，现在Web应用全挂了，想请大家帮忙出出主意：

• 第一次升级时因为手滑把源文件里的jammy写成了focal，导致系统只装了部分新包，无奈之下我改回源文件把系统“降级”了回去。
• 第二次升级过程还算顺利，但结束后发现Apache出问题了。查journalctl日志才发现Apache一直在找PHP7.4——系统显示已安装但实际根本没装上，于是我更新了PHP源，重新安装了PHP7.4。
• 现在Apache服务状态显示是绿色正常的，但Passenger相关进程的输出里有一大串空引号，看起来很奇怪：

├─2968 "Passenger watchdog" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ""
├─2971 "Passenger core" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ""

• 重启服务器后看Apache错误日志，只有这几条记录：

[Thu Dec 29 00:20:48.390727 2022] [mpm_prefork:notice] [pid 2965] AH00163: Apache/2.4.54 (Ubuntu) SVN/1.14.1 mod_fcgid/2.3.9 Phusion_Passenger/6.0.6 OpenSSL/3.0.2 mod_perl/2.0.12 Perl/v5.34.0 configured -- resuming normal operations
[Thu Dec 29 00:20:48.391005 2022] [core:notice] [pid 2965] AH00094: Command line: '/usr/sbin/apache2'
[ E 2022-12-29 00:20:50.7466 2971/T5 age/Cor/SecurityUpdateChecker.h:521 ]: A security update is available for your version (6.0.6) of Phusion Passenger. We strongly recommend upgrading to version 6.0.14.
[ E 2022-12-29 00:20:50.7468 2971/T5 age/Cor/SecurityUpdateChecker.h:526 ]: Additional security update check information:
- [Fixed in 6.0.14] [CVE-2018-25032] zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.
- [Fixed in 6.0.14] A use after free memory safety issue was introduced in 6.0.12, and fixed in 6.0.14.

• 另外我发现Phusion Passenger的相关文档里好像没提到18.04之后的Ubuntu版本，不知道这会不会是个隐患。

现在所有Web应用都跑不起来，这些应用都是基础配置，几乎没改过Apache和PHP的默认设置。我在纠结，是不是彻底卸载重装Apache会比慢慢排查错误更省时间？

欢迎大家给我一些排查方向或者建议，谢谢！

备注：内容来源于stack exchange，提问作者gipsea