byobu on my home server, and I noticed this today - what is it?
It's part of the byobu notification/status bar, on a 64-bit 11.10 server.
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From man pages:
updates_available - the number of updates available on the system; displayed in the lower bar toward the right in white text on a red background with a trailing '!' sign; if any updates are marked 'security updates', then there will be a total of two trailing exclamation points, '!!'
python3 /usr/lib/update-notifier/apt-check --human-readable. Dec 11, 2018 at 2:26
This shows the number of packages that need to be updated on the system.