do-release-upgrade is crashing when going from 16.04 to 18.04

Robert Heller heller at
Sat Apr 27 15:43:59 UTC 2019

At Fri, 26 Apr 2019 16:40:32 -0400 (EDT) Robert Heller <heller at> wrote:

> I recently upgraded a laptop from 14.04 to 16.04 using do-release-upgrade.  I 
> has been running just fine with  16.04, but I just tried to update it to 18.04 
> by running do-release-upgrade again, but do-release-upgrade is crashing.
> The only *possible* weirdness is that I am using a local mirror (built with 
> debmirror).  I did use this mirror to install a 18.04 VM (and have been 
> successfully keeping the VM up-to-date).  And I did use the mirror to upgrade 
> this laptop, another laptop, and (so far) one desktop machine from 14.04 to 
> 16.04.
> What should I be looking for to debug this problem?

OK, I retried this and determined that it was the stupid damn cacheing 
nameserver Ubuntu insists upon installing.  I'd just as soon just use the 
"real" (bind9) nameserver running on the server on the LAN.  So how to I get 
rid of the cacheing nameserver -- would just doing 'apt-get purge nscd' work?


Robert Heller             -- 978-544-6933
Deepwoods Software        -- Custom Software Services  -- Linux Administration Services
heller at       -- Webhosting Services

More information about the ubuntu-users mailing list