Unfortunately you can't avoid Safari on the iPhone. Even if you download Firefox for iPhone, it's actually using Safari Webview as the rendering engine. There's hope Apple might stop with this restriction, especially after a rather nasty vulnerability that was patched last year.
Ouch, so 32-bit Ubuntu ≤ 16.04 LTS
If I remember rightly too, there's no direct upgrade jump from a really old version straight to very latest; you have to upgrade to the next iteration each time.
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