Hello Vijay Aswadhati,
You could download LSDK 1809 from Layerscape SDK|NXP , please refer to the section "4.1.1Download and assemble LSDK images"
Login to Linux host machine and download the flexbuild source tarball.
Login to www.nxp.com to download flexbuild source tarball in the name format flexbuild_<version>.tgz
$ tar xvzf flexbuild_<version>.tgz
$ cd flexbuild
$ source setup.env
$ flex-builder docker (optional, only in case local host machine is not Ubuntu 18.04 system, to build LSDK in docker container)
$ source setup.env (execute only when using Docker, run this command after entering the docker container)
Have a great day,
TIC
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