I was not able to install Drive Software 9.0 on Ubuntu 18.04 by using SDK Manager, although Drive OS supports 18.04 based on the following link.
Dear dhruvildarji1409,
For DriveSW 9.0 the host system OS supported is Ubuntu 16.04. There is no support for Ubuntu 18.04.
For DriveSW 9.0, please refer to 5.1.0.2 doc. Thanks.