This installation script totally messed up my system, all icons in gnome-shell where missing, launching apps was impossible. Had to completely reinstall gnome to fix it. I won't try to reproduce. I don't know what happend but here are some clues:

First the extracted location contained a space in the directory name:
/home/user1/Downloads/arduino-1.8.13-linux64 (1)/arduino-1.8.13

Strange messages found in syslog
Dec 17 00:00:26 COMP gnome-shell[3957]: Could not load a pixbuf from icon theme.#012This may indicate that pixbuf loaders or the mime database could not be found.
Dec 17 00:00:27 COMP gnome-shell[3957]: Failed to load image: Unrecognized image file format
Dec 17 00:00:27 COMP gnome-shell[3957]: Bogus presentation time 0 travelled back in time, using current time.
Dec 17 00:00:27 COMP gnome-shell[3957]: Failed to load file:///var/lib/AccountsService/icons/user1: Unrecognized image file format
Dec 17 00:00:31 COMP gnome-shell[3957]: Removing a network device that was not added
Dec 17 00:00:49 COMP gnome-shell[3957]: Can't update stage views actor StLabel is on because it needs an allocation.
Dec 17 00:00:49 COMP gnome-shell[3957]: Can't update stage views actor ClutterText is on because it needs an allocation.
Dec 17 00:01:01 COMP gnome-shell[9148]: Telepathy is not available, chat integration will be disabled.
Dec 17 00:01:02 COMP gnome-shell[9148]: Failed to load background 'file:///home/user1/.local/share/backgrounds/mybackground.jpg': Unrecognized image file format
Dec 17 00:01:02 COMP gnome-shell[9148]: Could not load a pixbuf from /org/gnome/shell/theme/icons/scalable/status/message-indicator-symbolic.svg.#012This may indicate that pixbuf loaders or the mime database could not be found.
Dec 17 00:01:02 COMP gnome-shell[9148]: st_widget_get_theme_node called on the widget [0x5625e0c8c2e0 Gjs_ubuntu-dock_ubuntu_com_docking_DashToDock.bottom shrink running-dots extended:insensitive "dashtodockContainer"] which is not in the stage.
Dec 17 00:01:02 COMP gnome-shell[9148]: Spurious clutter_actor_allocate called for actor 0x5625e0c8c2e0/dashtodockContainer which isn't a descendent of the stage!
Dec 17 00:01:03 COMP gnome-shell[3957]: gnome-shell: Fatal IO error 0 (Success) on X server :0.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor Gjs_ui_appDisplay_AppIcon is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor StWidget is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor Gjs_ui_iconGrid_BaseIcon is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor StBoxLayout is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor StBin is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor StIcon is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor ClutterActor is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor StLabel is on because it needs an allocation.
Dec 17 00:01:07 COMP gnome-shell[9148]: Can't update stage views actor ClutterText is on because it needs an allocation.
Dec 17 00:02:08 COMP gnome-shell[9148]: ../clutter/clutter/clutter-offscreen-effect.c:239: Unable to create an Offscreen buffer
Dec 17 00:02:55 COMP gnome-shell[9148]: message repeated 947 times: [ ../clutter/clutter/clutter-offscreen-effect.c:239: Unable to create an Offscreen buffer]
Dec 17 00:15:20 COMP gnome-shell[9148]: gnome-shell: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.
Dec 17 01:40:31 COMP /usr/libexec/gdm-x-session[15844]: dbus-daemon[15844]: [session uid=123 pid=15844] Reloaded configuration
Dec 17 01:44:20 COMP gnome-shell[8983]: Window manager warning: Window 0x340002e sets an MWM hint indicating it isn't resizable, but sets min size 1 x 1 and max size 2147483647 x 2147483647; this doesn't make much sense.
Dec 17 01:47:50 COMP gnome-shell[8983]: Window manager warning: MetaSyncRing: Sync object is not ready -- were events handled properly?
Dec 17 01:47:50 COMP gnome-shell[8983]: message repeated 2 times: [ Window manager warning: MetaSyncRing: Sync object is not ready -- were events handled properly?]
Dec 17 01:47:50 COMP gnome-shell[8983]: Window manager warning: MetaSyncRing: Too many reboots -- disabling