The version string pattern is very odd, but I guess it's OK given that ureadahead was never published in Debian and the Ubuntu strings have never contained "ubuntu" anyway. Similarly I'd prefer an additional "." to indicate an SRU but the version numbering is so odd anyway it's not clear how to do that. Add -ubuntu0.1? That could be even more confusing. So I'll just accept as-is as I don't see any harm with 0.100.0-21.
The version string pattern is very odd, but I guess it's OK given that ureadahead was never published in Debian and the Ubuntu strings have never contained "ubuntu" anyway. Similarly I'd prefer an additional "." to indicate an SRU but the version numbering is so odd anyway it's not clear how to do that. Add -ubuntu0.1? That could be even more confusing. So I'll just accept as-is as I don't see any harm with 0.100.0-21.