Error Installing Mono project to run C# program in linux

I have installed LXDE 2.8 last stable version via Easy toradex installer.

We want to install mono to run a c# program.

The first we had made is

opkg update
opkg upgrade 

the error i encountered is:

pkg_run_script: package "alsa-state" postinst script returned status 99.
opkg_configure: alsa-state.postinst returned 99.

Anyone can help me with this?
I don’t know how it is be? i haven’t seen any information of this.

I try to do this, too:

opkg install mono 

With same results.

Hi @Kernel01

The first we had made is
opkg update
opkg upgrade

As described here opkg upgrade should not be done since this leads to unusuable System. You will need to go to recovery mode and reinstall the image using Toradex Easy Installer.

I try to do this, too:
opkg install mono

What is the error?

Best regards,
Jaski