Yes, the laptop came with 25.10 pre-installed. I did not do a dist-
upgrade or similar although I cannot guarantee whether the laptop did
that automatically upon first boot (given that there are some 24.04
packages installed - or is this "normal"?!)

I tried installing the package you suggested but unfortunately no
change:

======================

Selecting previously unselected package evdi.
(Reading database ... 356612 files and directories currently installed.)
Preparing to unpack .../evdi_1.14.15-181_amd64.deb ...
Unpacking evdi (1.14.15-181) ...
Selecting previously unselected package displaylink-driver.
Preparing to unpack .../displaylink-driver_6.2.0-30_amd64.deb ...
Unpacking displaylink-driver (6.2.0-30) ...
Setting up evdi (1.14.15-181) ...
Creating symlink /var/lib/dkms/evdi/1.14.15/source -> /usr/src/evdi-1.14.15


Error! Your kernel headers for kernel 6.17.0-1012-oem cannot be found at 
/lib/modules/6.17.0-1012-oem/build or /lib/modules/6.17.0-1012-oem/source.
Please install the linux-headers-6.17.0-1012-oem package or use the 
--kernelsourcedir option to tell DKMS where it's located.
dpkg: error processing package evdi (--configure):
 installed evdi package post-installation script subprocess returned error exit 
status 21
dpkg: dependency problems prevent configuration of displaylink-driver:
 displaylink-driver depends on evdi (>= 1.12.0) | evdi-dkms (>= 1.12.0); 
however:
  Package evdi is not configured yet.
  Package evdi-dkms is not installed.
  Package evdi which provides evdi-dkms is not configured yet.
 displaylink-driver depends on evdi (>= 1.12.0) | libevdi1 (>= 1.12.0); however:
  Package evdi is not configured yet.
  Package libevdi1 is not installed.
  Package evdi which provides libevdi1 is not configured yet.

dpkg: error processing package displaylink-driver (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup 
error from a previous failure.
                                                                                
                          Errors were encountered while processing:
 evdi
 displaylink-driver
Error: Sub-process /usr/bin/dpkg returned an error code (1)

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https://bugs.launchpad.net/bugs/2147081

Title:
  Cannot install displaylink-driver because of missing kernel headers

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