Software Updater broken on 16.04.x

[Colin Law]

On Sun, 7 Oct 2018 at 17:50, Bret Busby <bret at busby.net> wrote:

> ...
> bret at bret-Inspiron-580-UbuntuMATE:~$ sudo apt update
> sudo: unable to resolve host bret-Inspiron-580-UbuntuMATE
>

Before doing anything else I would fix that issue, have you attempted to
change the computers name?  If so then I think you may only have done half
of it.  Have a look at /etc/hosts and /etc/hostname.  They should both have
an entry for bret-Inspiron-580-UbuntuMATE.

/etc/hosts should include
127.0.0.1    localhost
127.0.1.1    bret-Inspiron-580-UbuntuMATE

and /etc/hostname should just contain bret-Inspiron-580-UbuntuMATE

After fixing those then reboot and the gui app may well work.

If you want to update using the  command line it should not be necessary to
do all the stuff Ralf suggests, just
sudo apt full-upgrade
should be enough, possibly followed by
sudo apt autoremove

Colin
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