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Created attachment 1030472 [details] screenshot Description of problem: Adding a new Mobile broadband connection is impossible because the entry is missing in add new connection menu Version-Release number of selected component (if applicable): 5.3.0
Looks that plasma-nm-5.3.0 was not built with ModemManager support and the build.log confirms that. I just checked the latest build (5.3.1) and there should be everything fine. You just need to wait for an update.
*** Bug 1226169 has been marked as a duplicate of this bug. ***