One of my firewalls has a Realtek RTL8125 on the motherboard and was using the os-realtek-re driver.
Upgrading to 26.7 failed after the os-realtek-re driver was updated, after which configd would not restart.
Removing the driver prior to the upgrade resolved the issue.
Add [SOLVED] or [TIP!] to your title so people know what's the status/purpose of the topic :)