pi@duet3:~ $ sudo apt-get update
Get:1 http://archive.raspberrypi.org/debian buster InRelease [32.6 kB]
Get:2 http://raspbian.raspberrypi.org/raspbian buster InRelease [15.0 kB]      
Get:3 https://pkg.duet3d.com stable InRelease [2,563 B]                        
Get:4 http://raspbian.raspberrypi.org/raspbian buster/main armhf Packages [13.0 MB]
Get:5 http://archive.raspberrypi.org/debian buster/main armhf Packages [392 kB]
Get:6 https://pkg.duet3d.com stable/armv7 armhf Packages [23.9 kB] 
Fetched 13.5 MB in 15s (927 kB/s)                                              
Reading package lists... Done