Sounds like the guest additions from the host just aren't up to date enough to
support newer kernels 6.16+. Although VirtualBox 7.2.0 claims to add support
for kernels 6.16 and 6.17:
https://www.virtualbox.org/manual/topics/ChangeLog.html#changelog-version-7_2_0
Another possibility is that guest additions support for Xorg guests has
regressed.
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Changed in: virtualbox (Ubuntu)
Status: Incomplete => New
** Changed in: xfce4 (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/2122228
Title:
XFCE display issue using VBox in 25.10
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