sage -i -> sage-run received unknown option: -i
I'm trying to install a sage package (namely plantri) using sage -i plantri. I receive the message: sage-run received unknown option: -i.
I have opened a sage shell via sage -sh and repeated the same command (sage -i plantri). Received the same message. I am using SageMath version 8.1, Release Date: 2017-12-07.
What am I doing wrong?
Are you using a system-wide SageMath, for instance installed as a Ubuntu package?
I have tried both. So using sage, installed as an ubuntu package; and manually downloaded and then using sage inside the sage directory.