Thanks for answer. Command apport-collect 1782880 has been executed successfully. The problem seems not to be related to any kernel version. It looks like that it is a plasma issue only. The reported problem pop up after an update some time ago, also on another computer that contains kubuntu 16.04.1, kubuntu 18.04 and windows 8.1.
If I execute KDE applications on running plasma desktop, they fail at selection NTFS mounted partions. If I execute the same KDE applications on ubuntu-desktop, they do as expected. Means, on ubuntu-desktop, NTFS mounted partitions are displayed and can be selected, e.g. by digikam, while digikam running on plasma-desktop. Test scenario: original installed desktop: kubuntu-desktop additional installed desktop: ubuntu-desktop fstab: # / was on /dev/sda5 during installation UUID=5ca944c9-9bd2-46f6-a7c1-bc4c7104239e / ext4 errors=remount-ro 0 1 # /home/a1/Data was on /dev/sda2 during installation UUID=02181F59181F4B55 /home/user/Data ntfs defaults,umask=007,gid=46 0 0 While the file open dialog of digikam on ubuntu-desktop knows the nTFS mounted partition “Data”, the file open dialog of digikam on kubuntu- desktop does not display partition “Data”. I included a picture of the digikam file open dialog about to select the picture folder. Additional plasma bug: the application on kubuntu-desktop do not consider the change of language to english. Just the KDE Application Launcher menu changed the language from german to english. In opposite, applications on ubuntu-desktop consider the new language setting to english. ** Attachment added: "file open dialog of digikam on kubuntu-desktop, NTFS partition "Data" does not exist" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1782880/+attachment/5168605/+files/digikam%20on%20ubuntu-desktop%20does%20not%20recocnize%20the%20ntfs%20partition%20data%20in%20the%20file%20open%20dialog%20%28language%20bug%20too%29.png ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1782880 Title: KDE applications can not select anymore fstab or cifs mounted NTFS partions Status in linux package in Ubuntu: Confirmed Bug description: I’m using dual boot systems with kubuntu and windows. The common data partitions are NTFS partitions. Most were mounted in fstab already during installation; like: /home/user/ntfspartion. All kubuntu application like dolphin, digikam, kdenlive did recognize these partitions correctly as mounted in users home folder. Other, not fstab mounted NTFS partions, but mounted by cifs were correctly recognized by apps in /media/user/ntfspartion. However since a few weeks kubuntu applications of ubuntu versions 16.04 and 18.04 do not know anymore NTFS mounting points! Dolphin does not show anymore fstab mounted NFTS partitions in the personal folder, only in the places sidebar. Partitions mounted by cifs still displayed by dolphin in the sidebar but not in the directory /media/user/. While the XFCE file manager thunar still works as required. Kubuntu applications like digikam or kdenlive can not select anymore fstab or cifs mounted NTFS partions, so KDE applications can not used anymore. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: a1 1714 F.... pulseaudio CurrentDesktop: KDE DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2017-10-05 (294 days ago) InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: SAMSUNG ELECTRONICS CO., LTD. 350V5C/351V5C/3540VC/3440VC Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic root=UUID=5ca944c9-9bd2-46f6-a7c1-bc4c7104239e ro quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-29-generic N/A linux-backports-modules-4.15.0-29-generic N/A linux-firmware 1.173.1 Tags: bionic Uname: Linux 4.15.0-29-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-07-13 (13 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 07/04/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P10AAL dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: NP350V5C-S05DE dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: BOARD REVISION 00 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP10AAL:bd07/04/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn350V5C/351V5C/3540VC/3440VC:pvrP10AAL.032.CP:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP350V5C-S05DE:rvrBOARDREVISION00:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: dmi.product.family: Eureka dmi.product.name: 350V5C/351V5C/3540VC/3440VC dmi.product.version: P10AAL.032.CP dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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