have somebody try to send GBB to linux wallet frome a windows wallet. cuz i cant
The OS doesn't matter.
The most common mistake about GBB is trying to send them without be paired to the recipient.
Pair both wallets, open a chat between your 2 devices, paste the address from the recipient device, click on the address appearing in chat and do 'Pay to this address'. The selection of GBB asset is now available on the sending form.