Version 5.6.15-1 of r-cran-lpsolve is marked for autoremoval from testing on Thu 30 Jun 2022. It depends (transitively) on nvidia-graphics-drivers-tesla-470, affected by #1011146. You should try to prevent the removal by fixing these RC bugs.
Last update: 2022-05-24
Problems while searching for a new upstream version
uscan had problems while searching for a new upstream version:
In watchfile debian/watch, reading webpage
http://cran.r-project.org/src/contrib/ failed: 500 Can't connect to cran.r-project.org:80 (Connection refused)