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Nelly
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On walls I would usually use Gardz which stabilises the surface, then emulsion. SOmetimes with bathroom you might want to use an oil based eggshell although that has wained in popularity, in that case I would use a primer like 123+ and maybe and undercoat from the same manufacturer as the eggshell too.
It looks like chalky paint/filler under the paint so gardz would be my first choice but 123+ is bootstraps in this case anyway, just more expensive and time consuming to apply.
Airhead
Not sure without seeing the walls, there are a few things that could cause bubbling. Usually with filler causing it the bubbles are very small. 123+ is the latest version of the primer. It has a bit more body.