Five parsing errors are reported all relating to /usr/share/applications/org.kde.mobile.okular. These are the above plus _chm.desktop; _djvu.desktop; _epub.desktop; _md.desktop and _tiff.desktop. In each case the error is described as 'Unknown error. Desktop file appears to be are valid' [the grammatical error 'to be are' is not a mistype on my part] STEPS TO REPRODUCE 1. Open Menu 2. Open Menu Editor (MenuLibre) 3. Check 'Details' OBSERVED RESULT Always as reported above. EXPECTED RESULT The program itself appears to run normally for general reading of PDF files, selecting text, and using the 'Review' tools. The unexplained parsing errors are a little worrying but do not appear to cause any actual problems. I would normally expect no parsing errors for a program conventionally installed and exhibiting no problems in day to day usage. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: My system is Linux Mint 20.1 XFCE ADDITIONAL INFORMATION Synaptic shows the following installed items libokularScore9 v. 4:19.12.3-2ubuntu1; okular 4:19.12.3-2ubuntu1; okular-extra-backends 4:19.12.3-2ubuntu1; okular-backend-odp, okular-backend-odt, okular-dev, okular-mobile and qml-module-org-kde-okular are not installed.. 15 occurances of Okular are listed in /usr/share/applications
The okular version you're testing is more than a year and a half old, please try a newer version and report again. And maybe tell us the errors you're getting, or you expect me to install that MenuLibre thing?
*** Bug 440822 has been marked as a duplicate of this bug. ***
From where do I get the newer version for my Xubuntu (i.e.non KDE) installation? How do I install it? I would give it a try. I love the capability of okular to highlight portions of pdf-files. That's very cute!