Not so much about upgrading, but afterwards ;-)

I have upgraded to Ascii, but:

cat /etc/devuan_version
jessie

And:

cat /etc/issue
Debian GNU/Linux 9 \n \l

The latest version of base-files seems to be installed:

dpkg-query -W -f='${Conffiles}\n' '*' | grep devuan_version
/etc/devuan_version 90e301dc00303665914b0d64d55d0457 obsolete

md5sum /etc/devuan_version
90e301dc00303665914b0d64d55d0457 /etc/devuan_version

But it says 'jessie' and what is the 'obsolete' all about ?

Rowland