SUMMARY 'QGIS 3.10.4+dfsg-1ubuntu2 (focal)' won't install on KDE Neon. I tried both before updating from 18.04 to 20.04 and after, and I also tried a fresh install of neon-user-20200815-2050. I tried both Discover and Synaptics Package Manager. In contrast, QGIS installs OK with Kubuntu 20.04. The KDE Neon installation fails on package 'qgis' broken dependencies: specifically, package 'qgis', Conflicts: uim-qt3 Breaks: qgis-common (<3.4.5) Breaks: qgis-provider-grass (<2.14.0) Recommends: qgis-provide-grass Suggests: gpsbabel Replaces: qgis-common (<3.4.5) Replaces: qgis-provider-grass (<2.14.0) STEPS TO REPRODUCE 1. Install neon-user-20200815-2050.iso 2. Open Discover or Synaptics Package Manager 3. Attempt to install QGIS OBSERVED RESULT Discover reports "Dependency resolution failed"; Synpatics reports QGIS is broken. EXPECTED RESULT QGIS installs SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Distributor ID: Neon Description: KDE neon Plasma LTS Edition 5.18 Release: 20.04 Codename: focal (available in About System) KDE Plasma Version: 5.18.5 (on update of 18.04, 5.19.? on fresh install) KDE Frameworks Version: 5.72.0 (on update of 18.04) Qt Version: 5.14.2 (on update of 18.04) ADDITIONAL INFORMATION Apologies if I have omitted any important information, or misunderstood anything. Thanks and regards
N.B. Andrew-63 was having a similar problem with KDE Neon 18.04 - https://gis.stackexchange.com/questions/351962/problem-installing-qgis-3-12-on-linux-kde-neon .
Definitely Neon issue: https://issues.qgis.org/issues/20542
Following an update recently - not sure exactly when - the problem is resolved, and QGIS3.10 has installed perfectly. I don't know who to thank, but thank you.
Still doesn't work on KDE Neon with latest updates NAME="KDE neon" VERSION="5.21" VERSION_ID="20.04" VERSION_CODENAME=focal UBUNTU_CODENAME=focal $ sudo apt install qgis-providers Reading package lists... Done Building dependency tree Reading state information... Done Starting pkgProblemResolver with broken count: 1 Starting 2 pkgProblemResolver with broken count: 1 Investigating (0) qgis-providers:amd64 < none -> 3.10.4+dfsg-1ubuntu2 @un puN Ib > Broken qgis-providers:amd64 Depends on qtbase-abi-5-12-8:amd64 < none @un H > Considering libqt5core5a:amd64 5446 as a solution to qgis-providers:amd64 9998 Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: qgis-providers : Depends: qtbase-abi-5-12-8 E: Unable to correct problems, you have held broken packages. $ apt list --installed libqt5core5a -a Listing... Done libqt5core5a/focal,now 5.15.2+dfsg-0xneon+20.04+focal+build23 amd64 [installed] libqt5core5a/focal 5.15.2+dfsg-0xneon+20.04+focal+build22 amd64 libqt5core5a/focal 5.15.1+dfsg-0xneon+20.04+focal+build21 amd64 libqt5core5a/focal 5.15.1+dfsg-0xneon+20.04+focal+build20 amd64 libqt5core5a/focal 5.12.8+dfsg-0ubuntu1 amd64