i have install monodevelop and write a hello world program in C# console but when in run configuration i choose run in external console check box and click on run button monodev
I had this problem on on Ubuntu 20.04 (using the latest monodevelop from PPA)
It was because on 20.04,
gnome-terminal-server
had moved from /usr/lib/gnome-terminal/
to /usr/libexec/
Monodevelop needs to be updated to take care of this.
My temporary fix:
cd /usr/lib
sudo mkdir gnome-terminal
sudo ln -s /usr/libexec/gnome-terminal-server