How do you upgrade from Netrunner 20 to 21?
I am not sure which synaptic package to pick?
Can someone assist me?
Upgrade from 20.01 and older
Existing users of Netrunner 20.01 can just update their system normally to get the same application versions provided in 21.01. To update the linux kernel and firmware you need to activate the Debian Buster Backports sources in the Synaptic package manager and install the linux-image-amd64 & firmware-linux packages from that source. As 20.01 and 21.01 are both based upon Debian stable updating them regulary does not require to reinstall Netrunner even if new release mediums appear (unless we recommend otherwise).
You can find this here
https://www.netrunner.com/netrunner-21-01-xoxo-released/