I have issue bug 410723. The problem is, that the stable snap image is still on version 1.10.0 (https://snapcraft.io/okular) STEPS TO REPRODUCE 1. Install okular using the snap store sudo snap install okular 2. Experience bug 410723 OBSERVED RESULT Spiky lines when using a tablet for writing. EXPECTED RESULT Same behavior as when drawing with mouse. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Ubuntu 20.10 (available in About System) KDE Plasma Version: KDE Frameworks Version: 5.68.0 Qt Version: Qt 5.14.1 (built against 5.14.1) ADDITIONAL INFORMATION clemens@hoth:~$ snap info okular name: okular summary: Document Viewer publisher: KDE✓ store-url: https://snapcraft.io/okular contact: https://bugs.kde.org/enter_bug.cgi?product=neon&component=Snaps license: unset description: | Okular is a universal document viewer developed by KDE. Okular works on multiple platforms, including but not limited to Linux, Windows, Mac OS X, \*BSD, etc. Features: - Supported Formats: PDF, PS, Tiff, CHM, DjVu, Images, DVI, XPS, ODT, Fiction Book, Comic Book, Plucker, EPub, Fax - Sidebar with contents, thumbnails, reviews and bookmarks - Annotations support commands: - okular snap-id: SfUqQ280Y4bJ0k64qtBKTTXq5ml46tvQ tracking: latest/stable refresh-date: today at 09:37 CET channels: latest/stable: 20.04.0 2020-04-23 (98) 20MB - latest/candidate: 20.12.2 2021-03-02 (104) 192MB - latest/beta: ↑ latest/edge: master+05338b0 2020-05-06 (99) 18MB - installed: 20.04.0 (98) 20MB - all other channels also do not work. latest/edge has the same issues, latest/candidate fails with clemens@hoth:~$ sudo snap refresh okular --channel=latest/candidate error: cannot perform the following tasks: - Ensure prerequisites for "okular" are available (cannot install prerequisite "kde-frameworks-5-qt-5-15-core20": no snap revision available as specified)
Please test latest version 22.12.3 in snap store.
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I moved away from snap. But it looks like the snap version of okular has been updated to multiple newer version.