Don't know where to report this as Armbian bug reporting form refused to accept community supported board, but it may not necessarily be board-specific.

 

When logging the first time there is a message: sed: -e expression #1, char 0: no previous regular expression

 

Generating locales: en_US.UTF-8
    _             _    _                                         _ _
   /_\  _ _ _ __ | |__(_)__ _ _ _    __ ___ _ __  _ __ _  _ _ _ (_) |_ _  _
  / _ \| '_| '  \| '_ \ / _` | ' \  / _/ _ \ '  \| '  \ || | ' \| |  _| || |
 /_/ \_\_| |_|_|_|_.__/_\__,_|_||_|_\__\___/_|_|_|_|_|_\_,_|_||_|_|\__|\_, |
                                 |___|                                 |__/
 v25.8 rolling for radxa cubie a5e running Armbian Linux 6.14.0-rc1-dev-sun55iw3

 Packages:     Debian stable (bookworm)
 Updates:      Kernel upgrade enabled and 2 packages available for upgrade
 Support:      for advanced users (rolling release)
sed: -e expression #1, char 0: no previous regular expression

 Performance:

 Load:         6%                Uptime:       17 min
 Memory usage: 7% of 1.93G
 CPU temp:     54°C                Usage of /:   15% of 6.7G

 Commands:

 Configuration : armbian-config
 Upgrade       : armbian-upgrade
 Monitoring    : htop

 

The second login does not show this message.

 

Hope this helps

Thank you for the report and this indeed does look like a general bug.  It appears as if this comes from the file 10-armbian-header and in particular line 199 or possibly line 214, but I cannot look into it further right now.  It's probably got something to do with network not being configured at the point at which you encountered this. 

 

I do certainly encourage you to open a ticket on github with the first entry on the pulldown "bug report for the armbian build framework".

Ok, thanks

github issue