Answer:
Neither Synonym , Nor Antonym ; but might be related.
Step-by-step explanation:
Ubiquitous is something which is present, exists, or os found everywhere. It can also be called as Pervasive, Omnipresent.
Confusing is something complex to to understand. It is unclearly or understandable or difficult to understand. It can also be called as perplexing, chaotic.
These words are neither synonym not antonym of each other. However they might be related with each other. Such because ; something which present everywhere i.e ubiquitous, might be difficult to be understood by people i.e confusing. Also; confusion is present everywhere in some or the other way , so confusion is Ubiquitous