When installing Git and Visual Studio Code, please refer to their official documentation to install it. I would recommend doing these rather than installing Ubuntu's snap packages as they tend to be slower in performance.

And of course, you are using Ubuntu which is Debian-based so installing a debian package should be great and smooth for you.

For Git:

https://git-scm.com/downloads/linux

#For the latest stable version for your release of Debian/Ubuntu

apt-get install git

# For Ubuntu, this PPA provides the latest stable upstream Git version

add-apt-repository ppa:git-core/ppa
apt update; apt install git

For Visual Studio Code:

Download the .deb (Debian, Ubuntu) under Linux category.

https://code.visualstudio.com/download

# After downloading it, install it using the following command

sudo apt install ./code-latest.deb

After doing all of these, it should be working out of the box now. Enjoy coding!