How to update krdc to latest version

Which Ubuntu release are you running, which version of kdrc do you currently have, and which one do you want?

The listing of all PPAs containing kdrc is here https://launchpad.net/ubuntu/+ppas?name_filter=krdc
but I doubt that you will find the newest version in one of them.

I see the following options:
1. ask the providers of the listed PPAs to update the version that they provide to the newest one
2. download and compile the newest version yourself on your own system.
3. create a PPA with the newest version yourself
4. create a bug report asking that the newest version be provided in the official Ubuntu repositories (will happen only in the development version of Ubuntu), and if such package it successfully built, ask for a backport of that version to older Ubuntu releases.

I'm running Ubuntu 16.04
Currently have KRDC 4.14.16 installed
Would like to upgrade to KRDC 4.15.12.3
Tried the APT install from http://www.ubuntuupdates.org/package/core/xenial/universe/base/krdc ... but ...
.... after I uninstalled 4.14.16 with http://installion.co.uk/ubuntu/vivid/multiverse/k/krdc/uninstall/index.html
the newly installed version was not accessible

Best regards

The standard Ubuntu repositories for 16.04 contain version 4:15.12.3-0ubuntu1
There should not be any need to use ubuntuupdates.org, but the normal package management programs should let you install it.

What is the output of

uname -a
lsb_release -crid
dpkg -l | grep krdc
apt-cache policy krdc
apt-get --simulate install krdc

<<<uname -a >>>>::
Linux maritz-HD-desktop 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 16:53:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

<<<lsb_release -crid>>>>>::
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial

<<dpkg -l | grep krdc>>>>::
ii krdc 4:15.12.3-0ubuntu1 amd64 Remote Desktop Connection client

<<apt-cache policy krdc>>>>::
krdc:
  Installed: 4:15.12.3-0ubuntu1
  Candidate: 4:15.12.3-0ubuntu1
  Version table:
 *** 4:15.12.3-0ubuntu1 500
        500 http://za.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

<<<apt-get --simulate install krdc>>>>::
NOTE: This is only a simulation!
      apt-get needs root privileges for real execution.
      Keep also in mind that locking is deactivated,
      so don't depend on the relevance to the real current situation!
Reading package lists... Done
Building dependency tree
Reading state information... Done
krdc is already the newest version (4:15.12.3-0ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

The currently available version from the applications launcher is::
KRDC
Version 4.14.16
Using KDE Development Platform 4.14.16

Why is the newest KRDC required?

What is the output of

which krdc

The 4.14.16 version runs stable 99.9%? of the time however,...

.... I experienced one system freeze yesterday (the CPU in overload) and had to power-down and reboot this morning with one (or more) of three apps that could have caused this, i.e. firefox, KRDC, thunderbird.

I assumed it could have been KRDC.... and then noticed a new version available...

......

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