Cancel my mailing that source.list. to r-sig-debian.
 I took one last look at the sources.list file and realised that I had the same 
repository repeated. I had read it as being commented out but it was not. 
Delete one line and I was fine. 
Nothing like blindness! I must have scanned that thing at least 3 or 4 times 
and totally missed it.  Your offer was gratefully received. I had not realised 
how often I use R in a day even just as a quick calculator.

Thanks to everyone for the help. I was just about ready to reinstall Ubuntu and 
not looking forward to 2 or 3 days of installations and customising. 
    On Sunday, March 3, 2019, 2:08:04 p.m. EST, John Kane <jrkrid...@yahoo.ca> 
wrote:  
 
  Thanks Ista,
Interestingly enough, I have only one repository as far as I can see. I was a 
bit amazed.
I think I have a faulty Ubuntu installation and will have to reinstall. What fun
 
    On Sunday, March 3, 2019, 1:16:52 p.m. EST, Ista Zahn <istaz...@gmail.com> 
wrote:  
 
 Hi John,

The official instructions at
https://cran.r-project.org/bin/linux/ubuntu/ work on a fresh
ubuntu:bionic from dockerhub. This suggests that the issue is due to
the configuration of your local system rather than with any problem
with either R or ubuntu. My guess is that you've been reading too many
blog posts and adding too many ppa's to your system, which can lead to
package conflicts. Unfortunately in that case it's hard for people to
help you remotely, since we don't know what you've done to your
system.

Best,
Ista

On Sun, Mar 3, 2019 at 6:20 AM John Kane via R-help
<r-help@r-project.org> wrote:
>
>
>  NOTE. This is a re-post of a message of Saturday 2018-03-03 sent with an 
>incorrect header.
>
> To upgrade to R.3.5.2 from 3.4.4 I have been following the instructions at 
> https://www.r-bloggers.com/installation-of-r-3-5-on-ubuntu-18-04-lts-and-tips-for-spatial-packages/
>  .
>
> I seem to have the repository properly connected and verified.
>
> I am getting an error: 
> ---------------------------------------------------------------------------------------------------
>  john@jonh-T510:~$ sudo apt install r-base r-base-core r-recommended Reading 
> package lists... Done Building dependency tree Reading state information... 
> Done Some packages could not be installed. This may mean that you have 
> requested an impossible situation or if you are using the unstable 
> distribution that some required packages have not yet been created or been 
> moved out of Incoming. The following information may help resolve the 
> situation:
>
> The following packages have unmet dependencies: r-base-core : Depends: 
> libreadline6 (>= 6.0) but it is not installable Recommends: r-base-dev but it 
> is not going to be installed E: Unable to correct problems, you have held 
> broken packages. 
> -------------------------------------------------------------------------------------------------
>  Earlier I was getting another error r-base-core : Depends: libpng12-0 but it 
> is not installable but that was cured by installing libpng12-0 via the Ubuntu 
> Software app.
>
> I cannot find what appears to be an installable version of libreadlines6.
>
> Ubuntu reports that the up-to-date version of libreadlines7.
>
> Should I consider this an R issue or an Ubuntu issue?
>
> In any case, has anyone encountered the problem and beaten it?
>
> Thanks
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.    
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