System does not boot after update. Failed to start...everything

[Aragorn]

@lee_mdk

What could be the problem?

Probably this…

[Stable Update] 2024-07-01 - Kernels, Systemd, KDE Gear, LibreOffice, Firefox, Wine, Qemu

* Support for cgroup v1 ('legacy' and 'hybrid' hierarchies) is now considered obsolete and systemd by default will refuse to boot under it. To forcibly reenable cgroup v1 support, SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 must be set on kernel command line. The meson option 'default-hierarchy=' is also deprecated, i.e. only cgroup v2 ('unified' hierarchy) can be selected as build-time default.

I would however advise you to use a more recent LTS kernel, such as 6.1. It’s probably less of a hassle.