Update: Bug assigned https://bugs.kde.org/show_bug.cgi?id=390007
Anyone else experiencing this? No crash message, it simply doesn't launch (launching with sudo does work, but I shouldn't have to do that).

Terminal output of "plasma-discover":

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QQmlApplicationEngine failed to load component
qrc:/qml/DiscoverWindow.qml:194 Type DiscoverDrawer unavailable
qrc:/qml/DiscoverDrawer.qml:67 Type SearchField unavailable
qrc:/qml/SearchField.qml:43 "TextField.hoverEnabled" is not available due to component versioning.

Errors when loading the GUI
invalid kns backend! "/etc/xdg/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation."
invalid kns backend! "/etc/xdg/servicemenu.knsrc" because: "Config group not found! Check your KNS3 installation."
Discarding invalid backend "ksysguard.knsrc"
Discarding invalid backend "servicemenu.knsrc"
setting currentApplicationBackend PackageKitBackend(0x107c0e0)


It stopped running on my system as well after updating to 5.12

System:
Plasma Version 5.12.0
KDE Frameworks Version 5.42.0
QT Version 5.9.3
Kernel Version 4.13.0-32-generic
OS Type 64 bit
Processor: Intel i7-6400K CPU
Memory 31.3 GiB of RAM

Here's my attempt to start Discover using the command line:

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jim@linux:~$ plasma-discover
QQmlApplicationEngine failed to load component
qrc:/qml/DiscoverWindow.qml:194 Type DiscoverDrawer unavailable
qrc:/qml/DiscoverDrawer.qml:67 Type SearchField unavailable
qrc:/qml/SearchField.qml:43 "TextField.hoverEnabled" is not available due to component versioning.

Errors when loading the GUI
invalid kns backend! "/etc/xdg/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation."
invalid kns backend! "/etc/xdg/servicemenu.knsrc" because: "Config group not found! Check your KNS3 installation."
Discarding invalid backend "ksysguard.knsrc"
Discarding invalid backend "servicemenu.knsrc"
setting currentApplicationBackend PackageKitBackend(0x12f2380)
jim@linux:~$


I also have Synaptic Package Manager on my system. It starts and runs normally.

Same here, it does not load, even when trying from konsole

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 alfred@alfred-laptop:~$ plasma-discover
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/16/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/22/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/24/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/32/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/48/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/64/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/128/"
Icon theme "gnome" not found.
QQmlApplicationEngine failed to load component
qrc:/qml/DiscoverWindow.qml:194 Type DiscoverDrawer unavailable
qrc:/qml/DiscoverDrawer.qml:67 Type SearchField unavailable
qrc:/qml/SearchField.qml:43 "TextField.hoverEnabled" is not available due to component versioning.

Errors when loading the GUI
invalid kns backend! "/etc/xdg/servicemenu.knsrc" because: "Config group not found! Check your KNS3 installation."
invalid kns backend! "/etc/xdg/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation."
Discarding invalid backend "servicemenu.knsrc"
Discarding invalid backend "ksysguard.knsrc"
setting currentApplicationBackend PackageKitBackend(0x228d1d0)
QThreadStorage: Thread 0x41a1290 exited after QThreadStorage 10 destroyed
alfred@alfred-laptop:~$
 

As oysteins already updated in OP, this is the bug report: https://bugs.kde.org/show_bug.cgi?id=390007

Stuff like this shouldn't happen on a LTS release, sorry for any inconvenience. As soon as a fix is available, you should be able to update just with apt from terminal.

Should be sorted now.

You can upgrade by running this in a Konsole `pkcon refresh && pkcon update`

Sorry I should have tested harder. We've added in a test for this now.

kde-jriddell wrote:Should be sorted now.

You can upgrade by running this in a Konsole `pkcon refresh && pkcon update`

Sorry I should have tested harder. We've added in a test for this now.

I suppose I could perform better than the testing framework. Just provide a list, like do
1.
2.
3
....

After doing `pkcon refresh && pkcon update`discover is running.
But every time I run it, a popup error comes out saying "cgcicon.knsrc: all categories are missing"
I dont't know what it is

I have the same issue.

Does anyone check these updates before release?