You can use the following commands in Ubuntu, Linux Mint, Mx Linux and other debian based Linux distributions to install adb and fastboot.
Error 1: bash: adb: command not found
Press ctrl+alt+t to launch Terminal
sudo apt install android-tools-adb
Or
sudo apt install adb
Error 2; bash: fastboot: command not found
sudo apt install fastboot
sudo apt install android-tools-fastboot .
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