Public bug reported:

Kubuntu 18.04 beta 20180404, installed to a virtual machine (Virtualbox
5.2.4, Kubuntu 17.10 host) for testing purposes.

I started the machine and since toolbar indicated there were updates, I
launched discover. I clicked "Update All" to install all updates and the
button text temporarily changed to "Cancel" but barely for long enough
to notice. Then it changed back to "Update All". No updates were done.

I retried several times with the same result. The final retry made the
button change permanently to "Cancel" with static "Tasks (0%)" display
at the bottom left corner. Nothing happened according to UI and top. I
had to kill the process.

I was able to update packages with apt-get without any problems.

I have successfully used discover twice before to update packages in
this same installation.

I see lines such as

couldn't find resource for "libtsan0;8-20180414-1ubuntu1;amd64;ubuntu-

in my ~/.xsession-errors. The lines appear to match the packages for
which updates were available. The set of lines also seems to be repeated
for about as many times as I retried the update.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: plasma-discover 5.12.4-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Apr 16 12:13:55 2018
InstallationDate: Installed on 2018-04-05 (10 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
SourcePackage: plasma-discover
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: plasma-discover (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  Nothing happens when attempting to "Update All" packages

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