In this case I would download the deb from here (Click on Mantic, and scroll down to files and find your architecture you use and download the file :
https://packages.ubuntu.com/search?keywords=libfreerdp2 and install it with dpkg -i If that installs successfully then continue your upgrade attempt.
In this case I would download the deb from here (Click on Mantic, and scroll down to files and find your architecture you use and download the file : https://packages.ubuntu.com/search?keywords=libfreerdp2 and install it with
dpkg -iIf that installs successfully then continue your upgrade attempt.