Is blu-ray writing support reliable yet?
Solution 1:
I've so far found blu-ray writing using growisofs to Verbatim BD-R disks using an LG BH10LS30 blu-ray writer to be reliable. I've only burned a small handful of disks so far, though.
Solution 2:
A new software seems to have a GUI for Bluray disc. It's Silicon Empire. You can install it in Ubuntu by downloading the package in the Downloads section, on the website.
Solution 3:
According to the cdrkit homepage, cdrecord has had Blu-Ray support since 2007. The homepages also states that all SCSI-3/mmc compliant drives and all ATAPI/mmc compliant drives are supported. I don't think there is a software issue. You should just look for a burner with good reviews.
Solution 4:
It is supported. Just needs some set up. See here https://help.ubuntu.com/community/CdDvd/Burning#Blu-Ray_Burning