There’s a small (i.e. non-fatal) bug in the timer setting of eos-update-notifier, before version 0.9.17-1.
The timer setting initiates an extra update check at first login, and that extra check will typically fail.
The bug should not cause any further trouble, but may show an unnecessary update failure at login, and is visible if you check the journal right after boot and login.
Version 0.9.17-1 removes that extra check.
To get rid of the bug, you need to run the following terminal commands:
sudo pacman -Syu # need to update 'eos-update-notifier' eos-update-notifier -init-force
The second command will modify and fix your update notifier timer file.
Note that if you have changed the checking schedule and want to re-use your changes, run command
to change the scheduling to your liking.