I have a problem that bugged me for quite some time now
I'm trying to Install Ubity3d on Ubuntu
I Followed some instructions that i've found after some research I downloaded and installed UnityHub and the latest release (UnitySetup-2019.1.0f2) that i found on Unity on Linux: Release Notes and Known Issues
and i moved the installed unity file from Home to opt folder and made it run on command unity3d and here is what i did exactly

sudo mv Unity-2019.1.0f2 /opt/Unity3D sudo ln -s /opt/Unity3D/Editor/Unity /usr/bin/unity3d 

and the problem is that every time i open Unity editor (via both the command line and UnityHub) the unity Launcher appears for moments to proccess and then crashes and the editor doesn't open and the error changes everytime i try to open the program here are 3 forms of errors that appeared to me, here is the first

Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. [Unity Package Manager (Upm)] Parent process [5258] was terminated Segmentation fault (core dumped) 

and the second

Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. (unity-editor:6651): Gtk-CRITICAL **: gtk_file_chooser_widget_set_current_name: assertion 'priv->action == GTK_FILE_CHOOSER_ACTION_SAVE || priv->action == GTK_FILE_CHOOSER_ACTION_CREATE_FOLDER' failed Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. [Unity Package Manager (Upm)] Parent process [6651] was terminated Segmentation fault (core dumped) 

the third is

Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. [0616/110743:ERROR:browser_main_loop.cc(161)] Running without the SUID sandbox! See https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment for more information on developing with the sandbox on. [0616/110744:ERROR:browser_main_loop.cc(207)] Gtk: gtk_window_present_with_time: assertion 'GTK_IS_WINDOW (window)' failed ATTENTION: default value of option force_s3tc_enable overridden by environment. USER@USER:~$ [Unity Package Manager (Upm)] Parent process [7583] was terminated 

and stuck on that....
well i know that there's something wrong with GTK but i have no experiace with it and i didn't find anything useful on this matter on google

OS: Ubuntu 16.04 LTC