Запустите sudo Exec в.desktop через pkexec :Ошибка Qt

вторая ссылка работала:

$ cat /usr/share/polkit-1/actions/org.freedesktop.policykit.virtualbox.policy 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE policyconfig PUBLIC
 "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
<policyconfig>
    <action id="org.freedesktop.policykit.pkexec.virtualbox">
    <description>Run VirtualBox as Admin</description>
    <message>Authentication is required to run VirtualBox as administrator</message>
    <icon_name>virtualbox</icon_name>
    <defaults>
        <allow_any>auth_admin</allow_any>
        <allow_inactive>auth_admin</allow_inactive>
        <allow_active>auth_admin</allow_active>
    </defaults>
    <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/virtualbox</annotate>
    <annotate key="org.freedesktop.policykit.exec.allow_gui">true</annotate>
    </action>
</policyconfig>

и

$ cat /usr/share/applications/virtualbox.desktop 
[Desktop Entry]
Name=VirtualBox
GenericName=PC virtualization solution

Type=Application
Exec=pkexec virtualbox %U
TryExec=VirtualBox
Keywords=virtualization;
Keywords[de]=Virtualisierung;
Keywords[ru]=виртуализация;
MimeType=application/x-virtualbox-vbox;application/x-virtualbox-vbox-extpack;application/x-virtualbox-ovf;application/x-virtualbox-ova;
Icon=virtualbox
Categories=Emulator;System;Utility;
Actions=RootManager;Manager
Comment=Run several virtual systems on a single host computer
Comment[de]=Mehrere virtuelle Maschinen auf einem einzigen Rechner ausführen
Comment[it]=Esegui più macchine virtuali su un singolo computer
Comment[ko]=가상 머신
Comment[pl]=Uruchamianie wielu systemów wirtualnych na jednym komputerze gospodarza
Comment[ru]=Запуск нескольких виртуальных машин на одном компьютере
Comment[sv]=Kör flera virtuella system på en enda värddator

[Desktop Action Manager]
Exec=virtualbox
Name=Open Oracle VM Manager
Name[de]=Oracle VM Manager öffnen

[Desktop Action RootManager]
Exec=pkexec virtualbox
Name=Open Oracle VM Manager (admin)