Thanks, that sounds like a good idea.
I tried to implement it, but initially had extensive problems getting 6.1.38 installed and then, once installed, 6.1.38 will not open a guest OS.
The installation problems seem to revolve around Jammy not using apt-key for key installations. Using the instructions at
https://www.virtualbox.org/wiki/Linux_Downloads puts the gpg key in the wrong directory. It needs to go into /etc/apt/trusted.gpg.d and the line added to sources.list should at most contain [arch=amd64], not a specification of where the gpg key is.
Anyway, that does put 6.1.38 in my package manager. But it appears only as virtualbox-6.1 and no ext-pack, dkms, guest-utils, or guest-x11 appear for 6.1.38. I installed 6.1.38 and left the other packages from 6.1.34. When I try to start a guest OS in 6.1.38, I get a 'Failed to load R0 module' (Unable to locate imported symbol 'SUPR0FpuBegin' for module 'VMMR0.r0' (VERR_SYMBOL_NOT_FOUND).).
At some point the Virtualbox management interface says that a new version of ext-pack is available and offers to install it. When I try to do that, I get: NS_ERROR_FAILURE (0x80004005) .