Deb package for Ubuntu25.10 depends on unavailable packages

$ sudo dpkg -i ~/Downloads/fastflowlm_0.9.40_ubuntu25.10_amd64.deb
Selecting previously unselected package fastflowlm.
(Reading database ... 400160 files and directories currently installed.)
Preparing to unpack .../fastflowlm_0.9.40_ubuntu25.10_amd64.deb ...
Unpacking fastflowlm (0.9.40) ...
dpkg: dependency problems prevent configuration of fastflowlm:
fastflowlm depends on libxrt2 (>= 1:2.21.75); however:
Package libxrt2 is not installed.
fastflowlm depends on libxrt-npu2; however:
Package libxrt-npu2 is not installed.

libxrt-npu2 only has a package for resolute, ie 26.04
libxrt2 only has a package for resolute, ie 26.04

$ sudo apt-get install libxrt2 libxrt-npu2
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package libxrt2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Package libxrt-npu2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libxrt2' has no installation candidate
E: Package 'libxrt-npu2' has no installation candidate

Reproduce the reported dpkg installation and apt dependency failures for fastflowlm_0.9.40_ubuntu25.10_amd64.deb on Ubuntu 25.10. Trace the package metadata that requires libxrt2 and libxrt-npu2, then verify the Ubuntu 25.10 package installs with dependencies available for that release.