Hi there.
I'm putting together a small cluster of Raspberry pis running Raspbian. They've all been setup identically from the same sd image.
They all update and install perfectly except one node which refuses to install anything. It has exactly the same login, network, user details etc, (obviously a different ip) but returns Unable to find package xxx every single time.
It does this through ssh, cnv, etc.
Any ideas?
Thanks.
Look at your log files.
That usually give the best clues.
The first thing to do is to run a full diagnostic (I prefer 'h2testw' on Windows) on that sdcard to check for bad sectors. If the card has bad sector(s) or has a completely fake (which is quite common these days unfortunately) capacity, then rewriting the boot image repeatedly to the card will get you nowhere.
First verify beyond any doubt that all sectors of the card are good.
May sound too basic, but did you remember to run 'apt update' after the initial install? You might want to look at /etc/apt/sources.list and files in /etc/apt/sources.d/* and make sure the repos are configured correctly.