In the step 1.3 Set up your keys, after executing

*sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654*,

I got

*gpg: keyserver receive failed: Connection timed out*

So does it when I run

*sudo apt-key adv --keyserver 'hkp://pgp.mit.edu:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654* .

What should I do? My ubuntu version is 20.04