Maintaining a fork of VICE on github is just waaay too much work. I'm just going to keep my patches somewhere instead. For now, that somewhere is a gist. This particular patch changes the quicksave/load menu item hotkeys to something that actually works on Ubuntu.

vice-gui-hotkey-alterations.diff

diff --git a/src/arch/unix/gui/uicommands.c b/src/arch/unix/gui/uicommands.c
index fe89b2b..5e4aea2 100644
--- a/src/arch/unix/gui/uicommands.c
+++ b/src/arch/unix/gui/uicommands.c
@@ -483,10 +483,10 @@ static UI_CALLBACK(sound_record_mp3)
     { "--", UI_MENU_TYPE_SEPARATOR },
     { N_("Quickload snapshot"), UI_MENU_TYPE_NORMAL,
       (ui_callback_t)load_quicksnap, NULL, NULL,
-      KEYSYM_F10, UI_HOTMOD_META },
+      KEYSYM_BRACKET_LEFT, UI_HOTMOD_META },
     { N_("Quicksave snapshot"), UI_MENU_TYPE_NORMAL,
       (ui_callback_t)save_quicksnap, NULL, NULL,
-      KEYSYM_F11, UI_HOTMOD_META },
+      KEYSYM_BRACKET_RIGHT, UI_HOTMOD_META },
     { "--", UI_MENU_TYPE_SEPARATOR },
     { N_("Select history directory"), UI_MENU_TYPE_NORMAL,
       (ui_callback_t)events_select_dir, NULL, NULL },
diff --git a/src/arch/unix/x11/gnome/uiarch.h b/src/arch/unix/x11/gnome/uiarch.h
index 21f54c8..01b8060 100644
--- a/src/arch/unix/x11/gnome/uiarch.h
+++ b/src/arch/unix/x11/gnome/uiarch.h
@@ -78,7 +78,9 @@ enum ui_keysym_s {
     KEYSYM_F9  = GDK_F9 ,
     KEYSYM_F10 = GDK_F10,
     KEYSYM_F11 = GDK_F11,
-    KEYSYM_F12 = GDK_F12
+    KEYSYM_F12 = GDK_F12,
+    KEYSYM_BRACKET_LEFT = GDK_bracketleft,
+    KEYSYM_BRACKET_RIGHT = GDK_bracketright
 };
 typedef enum ui_keysym_s ui_keysym_t;