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

[Robert Heller]

At Sat, 27 Apr 2019 12:15:04 -0400 paul at mad-scientist.net wrote:

> 
> 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.

Ok, then I need to get rid of systemd-resolve or else disable it.  I have/will 
have some other 16.04 systems to update, and I know that nscd on 14.04 has 
always been a pain.  I think the problem is that nscd is not always 
respecting the LAN-provided DNS server and is wanting to use 8.8.8.8 and 
4.4.4.4, which is fine when there is "nothing" on the LAN (no intranet 
services)...  I don't know if systemd-resolve is any better.  I really want 
these machines to use the DNS server provided by the DHCP server and not try 
to play "games" with some kind of machine-local caching DNS server.  The LAN 
server is *already* caching DNS for the LAN, as well as providing DNS for the 
mahines on the LAN, including LAN-provided services.

> 
> 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.
> 
>                                                                                                                           

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