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ros2-crystal-20190408-linux-bionic-arm64

and

OSError: [Errno 8] Exec format error

is your system an ARM8 system in 64bit mode? What is the output of uname -a?

ros2-crystal-20190408-linux-bionic-arm64

and

OSError: [Errno 8] Exec format error

is your system an ARM8 system in 64bit mode? What is the output of uname -a?

ros2-crystal-20190408-linux-bionic-arm64

and

OSError: [Errno 8] Exec format error

is your system an ARM8 system in 64bit mode? What is the output of uname -a?

Also:

source /opt/ros/crystal/setup.bash
source /home/deepan/ros2_install/ros2-crystal-20190408-linux-bionic-arm64/ros2-linux/setup.bash

why are you mixing Debian packages with the Linux archives?

ros2-crystal-20190408-linux-bionic-arm64

and

OSError: [Errno 8] Exec format error

is your system an ARM8 system in 64bit mode? What is the output of uname -a?

Also:

source /opt/ros/crystal/setup.bash
source /home/deepan/ros2_install/ros2-crystal-20190408-linux-bionic-arm64/ros2-linux/setup.bash

why are you mixing Debian packages with the Linux archives?

Edit:

My system is not arm.

obvious, but you should download the correct binaries for your architecture.

why are you mixing Debian packages with the Linux archives?

I just want to check this way. Anyway Iam using Debian Package only.

Can you please suggest me which one is better? either using debian package or linux archives?

If you're just starting you, starting, I'd install the Debian packages. They're automatically updated for you and your installation is managed by the system's package manager.