It seems the -debug flag has no effect :( > [2019.09.18 10:52:38] Launched version: 1008008, install beta: [FALSE], alpha: 0, debug mode: [FALSE], test dc: [FALSE] [...] > [2019.09.18 10:52:38] Command line: telegram-desktop -debug I attached the log for a successful start with uninstalled libqt5-qtstyleplugins-platformtheme-gtk2 and a failed one anyway.