Installation halted libxenlight domain sys-net

[apparatus]

libxl: libxl_dm.c:2857:stubdom_xswait_cb:domain 5:Stubdom 6 for 5 startup: startup timed out.
libxl_create.c:1975:domcreate_devmodel_started: Domain 5:device model did not start: -9

Application missing on freshly installed Qubes OS 4.1.2

Maybe you had some issue during installation. Reinstalling Qubes OS helped in similar case: Try to install Qubes OS 4.2.2-rc1. Maybe you can also install it with kernel-latest option so you can test the latest kernel if the issue persists with stable kernel after reinstall.

Check /var/log/xen/console/guest-sys-net-dm.log log.