I have trouble in my apt install, since Gambas3 is field to install in my machine, I cant install other apt on my terminal. If I gonna install other application, my terminal showing me this dialogue. What should I do about this?
Hi and welcome to the forum 
You need to add
sudo
before the command.
sudo apt --fix-broken install
I think you need to use that powerful but dangerous 
rm -rf command.
Let me invoke our master volunteer 
@Aravisian
Back up personal...fresh install
Nah, I think it is an over-kill.
sudo apt remove --purge gambas3
If that fails,
sudo dpkg --configure -a
Then do the first remove command.
Thats was for last resort for worst case scenario alright 
Did you reboot after following instructions ?
When you tried to install, had you added the gambas repository?
what repos should I add?
I will take that as a "no..."
sudo add-apt-repository ppa:gambas-team/gambas3 && sudo apt update
sudo apt --fix-broken install
Nothing change to the situation
What output did sudo apt --fix-broken install give you after you added the repository?
If it is exactly the same as in the O.P. try:
sudo apt install -f gambas3
If needed, then run:
sudo dpkg --configure -a
sudo apt install -f gambas3
sudo apt clean && sudo apt autoclean && sudo apt autoremove
sudo apt install -f gambas3
I just checked... and there is no package in the Ubuntu repo for gambas3-dev-tools.
Is this some obnscure package?
How does no one notice this?
Or is it some far-flung conspiracy to Push Snap Packages by saying, "oh... look... dependency problems..."
If you added the Gambas3 Repository and ran sudo apt update and sudo apt clean... This really should not be happening.
Because it is in the gambas team repository:
gambas3-dev-tools Gambas compilation tools
Here is the .deb for it:
https://launchpad.net/~gambas-team/+archive/ubuntu/gambas3/+files/gambas3-dev-tools_3.16.3+git202109141524.185a3d4a3+build15~ubuntu20.04.1_amd64.deb
Try Closing out the terminal.
Then installing this .deb file.
Then open a terminal and try
sudo apt --fix-broken install
