/usr/bin/env: ‘bash\r’: No such file or directory
This is a line endings issue, but not from Ubuntu. Make sure you do have node and npm installed correctly by using the command:
sudo apt install nodejs npm
Then stop Windows path variables being shared with WSL by editing the /etc/wsl.conf file in WSL. If the file doesn't exist, execute sudo touch /etc/wsl.conf first. Edit the file with the command sudo nano /etc/wsl.conf and add the following configuration:
# Wsl.conf
[interop]
appendWindowsPath = false
Then restart WSL2 with command wsl --shutdown in Windows(Powershell or CMD).