Thanks! Unfortunately it only solved half the problem. I'm getting this now:

stellarmate@stellarmate:~ $ sh -c 'busybox wget deb.trendtechcn.com/install -O /tmp/install && sh /tmp/install'
Connecting to deb.trendtechcn.com (185.199.108.153:80)
Connecting to deb.trendtechcn.com (185.199.110.153:443)
install              100% |********************************| 16512  0:00:00 ETA
Root access is required
Package manager is: apt-get
Installing prerequisites
Hit:1 ppa.stellarmate.com/repos/apt/stable buster InRelease
Hit:2 mirrors.ocf.berkeley.edu/debian buster InRelease                  
Hit:3 raspbian.raspberrypi.org/raspbian buster InRelease                
Reading package lists... Done
Couldn't detect the appropriate kernel headers package!

 

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