Monodevelop Questions

[gustlgans]

Hello,
I installed monodevelop (7.8.4) on a freshly installed ubuntu 20.04. Whenn creating GTK# 2.0 Projects it always uses Gtk# Version 2.4.0.0 which ist somewhat ancient. I can use newer version via nuget but this will deactivate the GUI-Designer
I have installed GTK# 2.12.0.45 on my machine. How can I configure monodevelop to use that?
Thanks
gustl

[gustlgans]

I found a walkaround for that problem
Provided you have a fresh installation of ubuntu 20.04 (or Linux Mint 20.1) proceed as follows:

sudo apt-get install mono-complete -y
sudo apt-get install gtk-sharp2 -y
sudo apt install apt-transport-https dirmngr
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/ubuntu vs-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-vs.list
sudo apt update
sudo apt-get install monodevelop -y

Now start monodevelop and create a GTK2-Project. You will find that mondevelop tries to use GTK 2.12. but it won't compile - it claims that the namespace GTK cannot be found. To fix this do the following

sudo apt install dirmngr gnupg apt-transport-https ca-certificates software-properties-common
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo apt-add-repository 'deb https://download.mono-project.com/repo/ubuntu stable-focal main'
sudo apt install mono-complete -y

Now everything is working as expected.
For an "old" Ubunut 20.04-Istallation: Purge all mono/monodevelop installations completely, remove the repositories and the configurationfiles (dpkg -l | grep "^rc") as well. I my case this did the trick.
gustl