per Nick Koretsky: | none of this conflicts with trinity on debian. Either ubuntu pacakges are | broken or you installed some libs from ppas and now have version conflicts. | Start aptitude in interactive mode and look for what exactly brakes when | you add this packages. here's what happens when i try to install protonmail-bridge: Selecting previously unselected package protonmail-bridge. (Reading database ... 1534488 files and directories currently installed.) Preparing to unpack .../protonmail-bridge_1.0.3-1_amd64.deb ... Unpacking protonmail-bridge (1.0.3-1) ... dpkg: dependency problems prevent configuration of protonmail-bridge: protonmail-bridge depends on qt5-default; however: Package qt5-default is not installed. protonmail-bridge depends on libqt5designer5; however: Package libqt5designer5 is not installed. protonmail-bridge depends on libqt5multimediawidgets5; however: Package libqt5multimediawidgets5 is not installed. protonmail-bridge depends on libqt5quickwidgets5; however: Package libqt5quickwidgets5 is not installed. dpkg: error processing package protonmail-bridge (--install): dependency problems - leaving unconfigured Processing triggers for gnome-menus (3.10.1-0ubuntu2) ... Processing triggers for desktop-file-utils (0.22-1ubuntu1.1) ... Processing triggers for mime-support (3.54ubuntu1.1) ... Errors were encountered while processing: protonmail-bridge RESULT=1 so let's install the dependencies, beginning with qt5-default: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: protonmail-bridge : Depends: libqt5designer5 but it is not going to be installed Depends: libqt5multimediawidgets5 but it is not going to be installed Depends: libqt5quickwidgets5 but it is not installable qt5-default : Depends: qtbase5-dev but it is not going to be installed N: Ignoring file 'brave-trusty.listgrep' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension N: Ignoring file 'brave*' in directory '/etc/apt/sources.list.d/' as it has no filename extension N: Ignoring file 'brave-trusty.listgrep' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension N: Ignoring file 'brave*' in directory '/etc/apt/sources.list.d/' as it has no filename extension N: Ignoring file 'brave-trusty.listgrep' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension N: Ignoring file 'brave*' in directory '/etc/apt/sources.list.d/' as it has no filename extension E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). so let's do what it suggests and run apt-get -f install: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following packages were automatically installed and are no longer required: acpi amarok-common-trinity amarok-engine-xine-trinity amarok-trinity arts-trinity bluetooth bluez-utils crystalcursors desktop-effects-tde-trinity dmz-cursor-theme fonts-arabeyes foo2zjs fortune-mod fortunes-min fotoxx-common gir1.2-ges-1.0 gir1.2-gst-plugins-base-0.10 gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-0.10 gir1.2-gstreamer-1.0 gstreamer1.0-gnonlin gtk-qt-engine-trinity gtk3-tqt-engine-trinity gwenview-trinity kaffeine-trinity karm-trinity katapult-trinity kbstate-trinity kdbusnotification-trinity keep-trinity kmag-trinity kmailcvt-trinity kmousetool-trinity kmplayer-base-trinity kmplayer-konq-plugins-trinity konversation-trinity kopete-trinity kpf-trinity kppp-trinity krdc-trinity krfb-trinity ksplash-engine-moodin-trinity ksystemlog-trinity ktorrent-trinity kubuntu-default-settings-trinity kubuntu-konqueror-shortcuts-trinity kvkbd-trinity landscape-client landscape-common lftp libavahi-tqt-1 libccfits0 libcfitsio3 libdbus-tqt-1-1c2 libges-1.0-0 libifp4 libjs-sphinxdoc libllvm3.8v4 libmp4v2-2 libnjb5 libqt5concurrent5 libraw9 librsync1 libscim8c2a libwayland-dev min12xxw pnm2ppa powermanagement-interface pxljr python-gst-1.0 python-pylibacl python-pyxattr qt4-tqt-theme-engine qt5-qmake qtbase5-dev-tools rdesktop rdiff-backup scim-bridge-client-qt scim-im-agent scim-modules-socket screen speedcrunch splix strigi-daemon synaptic-trinity tqca-tls ttf-arabeyes ttf-arphic-ukai ttf-arphic-uming ttf-lao ttf-malayalam-fonts ttf-thai-tlwg ttf-unfonts-core Use 'apt-get autoremove' to remove them. The following packages will be REMOVED: fotoxx gimp-gmic gir1.2-clutter-gst-1.0 gir1.2-clutter-gst-2.0 gir1.2-gtkclutter-1.0 kubuntu-desktop-trinity libchamplain-0.12-0 libchamplain-gtk-0.12-0 libclutter-gst-1.0-0 libxatracker2 luminance-hdr pitivi protonmail-bridge xorg xserver-xorg-video-vmware 0 upgraded, 0 newly installed, 15 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 33.1 MB disk space will be freed. see the problem? among other things, i believe that xorg is crucial to full enjoyment of the tde experience. dep Sent with [ProtonMail](https://protonmail.com/) Secure Email. Because privacy matters.