When trying to downloading Minecraft on Ubuntu 20.04 LTS via the "Buy Minecraft" dialogues and selecting Linux for "What platform do you prefer", leading to the https://my.minecraft.net/en-us/store/minecraft/#owned page, the "Download for your distribution" button links to https://my.minecraft.net/en-us/store/minecraft/my.minecraft.net/download/ (immediately leading to a 404) rather than the intended https://my.minecraft.net/download/