Looking at any solution I find similar error for VirtualBox: https://www.virtualbox.org/ticket/17425?cversion=0&cnum_hist=3
and I use similar solution with success! borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/virtualbox/*.so | grep "not found" borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/virtualbox/components/*.so | grep "not found" borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so | grep "not found" libxcb-xinerama.so.0 => not found borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/virtualbox/*.so | grep "not" borkowsk@wojciech-CELSIUS-7:~$ sudo apt --reinstall install libxcb ... borkowsk@wojciech-CELSIUS-7:~$ konsole & borkowsk@wojciech-CELSIUS-7:~$ krusader Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/16/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/22/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/24/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/32/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/48/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/64/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/128/" kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp" kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp" kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp" kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp" kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp" kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp" Still krusader have some warnings but now it can start! ** Bug watch added: Virtualbox Trac #17425 http://www.virtualbox.org/ticket/17425 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1772900 Title: This application failed to start because it could not find or load the Qt platform plugin "xcb" in "". To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1772900/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs