Writing from your Unity7 remix Live. Took a bit of a time to boot. (Didn’t matter, as I am watching Cricket today too.) Booted to a good old Ubuntu!
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Make your own apps to appear in the Unity launcher. There’s Nautilus icon still there, which would open it, claiming it is opening the Trash. Put Caja there. Btw, it is called DocSurf. Also, uninstall (or hide) Nautilus.
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All other apps opens quite fast, as they should be. I notice that there are no snaps, which is good, as Calculator and System Monitor opens faster than in 19.04 where they happen to be installed as snaps.
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Pinguy Builder doesn’t appear to keep your settings, when building the iso. Try rsync. Or, manually do the steps from Pinguy builder/Remastersys.
You are using ubuntu-unity-desktop to get unity 7 working in your remix. So, contact @khurshid-alam, who actually creates and maintains it. Have a look at this thread, and this and this from the beginning. And, join this team.
18.10 is going to live only for next 3 months, so maybe best put your efforts on 19.04 and then on 19.10.