I'm using the Raspberry Pi Imager tool to flash Ubuntu Server 20.04.1 LTS ARM 64-bit onto a microSD card. Then, I take that microSD card and insert it into a Raspberry Pi 3 B+. After that, the unattended-upgrades
agent takes quite some time to download and install all of the updates (30+ minutes).
I would like to speed this process up by applying the latest package updates to the microSD card, on my Windows 10 computer, before moving the SD card to the Raspberry Pi.
Question: Is there a way to apply updates offline to Ubuntu Server on a microSD card?