Congratulations, you've installed a brand new Linux Mint 20.1 Ulyssa! What's best for you to do, first of all?
I've made a list with 10 things to do, for all editions:
10 things to do in Linux Mint 20.1 Cinnamon (the main edition)
10 things to do in Linux Mint 20.1 MATE
10 things to do in Linux Mint 20.1 Xfce
|Spreekt u Nederlands? Dezelfde lijstjes in het Nederlands zijn hier te vinden.|
Need (another) iso? You can get the iso's here:
Linux Mint 20.1 Ulyssa
iso of Cinnamon 64-bit
iso of MATE 64-bit
iso of Xfce 64-bit
Do you have very new hardware? In case your very recent computer can't boot from the Mint USB stick (or DVD), and only then, try the Edge iso which contains a kernel from a newer series.
You can check the integrity of the iso that you've downloaded, in the following way.