More pedantic: Linus' is correct because Linus is a proper noun.
This is hardly a authoritative citation, but it cites a number of authority and comports with my understanding as someone whose name ends in `s`:
"Nearly all authorities agree that if you want to make a possessive out of a singular noun like Kansas that ends in an s, you need to add ’s at the end. Just call it “Ross’s Rule.”"
https://www.legalwritingpro.com/articles/feeling-possessive/
> Personal names ending in s are these days often given the regular apostrophe s, whatever their number of syllables or their sound:
>
> Burns's poetry
> Dickens's novels
>
> Those who have occasion to refer to classical or biblical names of several syllables may still prefer the apostrophe alone, as with:
>
> Jesus' teachings
> Moses' law
> Euripides' plays
But if you’re describing a family possession, it would be Rosses’ as is possessed by more than one Ross.