Hi,
> Hi Alan!
>
>> I've installed an additional Linux Debian package mbmon, and it works
>> but at every Tails start I see update additional software update message.
>
> Thanks for reporting. To me it looks like the the last server to update
> package files from was unreachable, and hence you get this error log.
It's already been reported on the following ticket, and should be fixed in the next release:
