On Friday, 22 February 2019 13:30:40 GMT Ralph Corderoy wrote:
> You are not alone.
> https://askubuntu.com/questions/1120379/my-printer-adds-a-blue-background

That must have been posted after I did my search today.

> Not familiar with that one.  What about /var/log/apt?

That has a lot of info about upgraded packages since I last printed.  Here is 
the relevant 
tail:

Start-Date: 2019-02-21  16:01:29
Commandline: packagekit role='update-packages'
Requested-By: terry (1000)
Upgrade: libgs9:amd64 (9.26~dfsg+0-0ubuntu0.18.10.4, 
9.26~dfsg+0-0ubuntu0.18.10.5), 
ghostscript:amd64 (9.26~dfsg+0-0ubuntu0.18.10.4, 9.26~dfsg+0-0ubuntu0.18.10.5), 
ghostscript-x:amd64 (9.26~dfsg+0-0ubuntu0.18.10.4, 
9.26~dfsg+0-0ubuntu0.18.10.5), 
libgs9-common:amd64 (9.26~dfsg+0-0ubuntu0.18.10.4, 9.26~dfsg+0-0ubuntu0.18.10.5)
End-Date: 2019-02-21  16:01:33

Start-Date: 2019-02-22  09:22:04
Commandline: /usr/bin/unattended-upgrade
Upgrade: libdns-export1102:amd64 (1:9.11.4+dfsg-3ubuntu5, 
1:9.11.4+dfsg-3ubuntu5.1)
End-Date: 2019-02-22  09:22:06

Start-Date: 2019-02-22  09:22:09
Commandline: /usr/bin/unattended-upgrade
Upgrade: libisc-export169:amd64 (1:9.11.4+dfsg-3ubuntu5, 
1:9.11.4+dfsg-3ubuntu5.1)
End-Date: 2019-02-22  09:22:10

Start-Date: 2019-02-22  09:22:13
Commandline: /usr/bin/unattended-upgrade
Upgrade: libisccfg160:amd64 (1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), 
libirs160:amd64 (1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), 
bind9-host:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), dnsutils:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), libisc169:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), liblwres160:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), libisccc160:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), libbind9-160:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1), libdns1102:amd64 
(1:9.11.4+dfsg-3ubuntu5, 1:9.11.4+dfsg-3ubuntu5.1)
End-Date: 2019-02-22  09:22:16

> What's the package that provides HPLIP?  What does `apt-cache policy
> $packagename' show?

Well not a lot that meant anything to me.  I tried typing:
   apt-cache policy $packagename

exactly as you provided it, but it didn't really show anything useful:

apt-cache policy $packagename 




I then tried:
  apt-cache policy $hplip

and got exactly the same.

However, Synaptic informed me that HPLIP is provided by 3.18.7+dfsg1-2ubuntu2), 
but the 
changelog says it has not been changed since October.

I see that dfsg appears in the apt log, but that is dfsg-3, not dfsg1.  I'm not 
sure how 
relevant that is.

I've posted the content of the apt log to the Ask Ubuntu site above in answer 
to the 
original question.

I await results....

-- 



                Terry Coles
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