I am getting a strange message whenever I run
sudo, ever since upgrading my MS Windows 10 WSL Ubuntu 16 –> Ubuntu 18.
The message is
sudo: setrlimit: Function not implemented
The upgrade seemed to go very well, with the only hickup coming at the very end, when it complained that the ssh configuration files had been modified. After some strangeness with trying to compare configuration files, I finally just told it to overwrite the old files, and things seemed to finish smoothly.