Yet I know that a lot of these ugly jobs will be taken over by robots

I expected that answer from a communist. You took away my chance to pounce on them for it.

You see they WILL fall on this. They will want to be communist or socialist now and will talk about this great technology that "does not yet exist" at the level required to do these tasks as the solution.

So what happens until that technology exists in your newly communist/socialist revolution nation?

Do you ignore all those unpleasant tasks and just let them go unattended until you invent and manufacture the tech needed to do them? (putting your hopes that someone will have the desire to invent when they won't get any special benefit other than perhaps pride for doing so.)

Does the trash pile up?

Does the sewage go untreated?

Does the feces accumulate and spread on the streets?

Do you stop eating crab?

Also how long will it take for someone to actually make this technology when the people that have to make it receive the same resources as the person who sits on the couch waiting for it to be done? As I said before some will likely do it, though I can guarantee many will not.

What about safety inspections of such robots or tech?

Who is going into those unpleasant environments to do that?
:)