The qt dependencies on Ubuntu have changed.

qt5-default has been accordingly replaced with qtbase5-dev

documentation/docs/dev/index.md

@@ -66,7 +66,7 @@ echo 'export PATH="/opt/homebrew/opt/qt@5/bin:$PATH"' >> ~/.zshrc
 On Ubuntu, you can install all the needed third-party dependencies by using the built-in `apt` package manager:
 
 ```bash
-sudo apt-get update -qq && sudo apt-get install -y -qq git cmake wget unzip build-essential freeglut3-dev libboost-all-dev qt5-default libeigen3-dev libxerces-c-dev libsqlite3-dev
+sudo apt-get update -qq && sudo apt-get install -y -qq git cmake wget unzip build-essential freeglut3-dev libboost-all-dev qtbase5-dev libeigen3-dev libxerces-c-dev libsqlite3-dev
 ```
 
 ### Linux/Fedora