On June 11, 2021, a user by the name of ImSlappy826 (Slappy826#0001 on Discord) created a one-line patch for Wine that allowed the Roblox Player to work again on a GNU/Linux or BSD system.
This patch was released in the development release of Wine 6.11. Here are the steps on installing it on Ubuntu:
Add the repository key
Add the repository. Consult this table for the command to run.
Install Grapejuice and its dependencies
Search for Grapejuice through your applications and open it up