Privileged access to your Linux system as root or via the sudo command.
# - requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command $ - requires given linux commands to be executed as a regular non-privileged user
Change default browser on Ubuntu 20.04 step by step instructions
Open up Ubuntu 20.04 Gnome settings and click on Default Applications
Alternatively you can open the Default Applications setting from command line:
$ gnome-control-center default-applications
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Given that you have already installed an alternative web browser like for an example Google Chrome you can select it from a corresponding Web menu.