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

[Paul Smith]

On Sat, 2019-04-27 at 11:43 -0400, Robert Heller wrote:
> 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?

I don't know where nscd is coming from on your system, but just FYI
it's not installed at all on either of my systems: one upgraded through
18.04 to (currently) 18.10 (but I'm not sure what the last cleanly
install version was) and the other installed with Ubuntu 18.04 from
scratch.

For quite a while now Ubuntu has used first dnsmasq, and then systemd-
resolve, and so nscd has been obsolete.

So it's definitely not needed or installed by "recent" Ubuntu releases
and if you don't want it I see no reason you shouldn't purge it.