Yureka fastboot not detected in LINUX, but adb detects device

fastboot detects Redmi 2, but not Yureka. I am trying to install Cyanogenmod in Yu Yureka. When I tried installing the CM zip with default recovery, it failed stating "Signature Verification Failed". So I tried to install the TWRP recovery using fastboot. I did the following: root@konoha:~# adb devices List of devices attached 2a25599 device root@konoha:~# lsusb Bus 003 Device 002: ID 046d:0825 Logitech, Inc. Webcam C270 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 007 Device 002: ID 046d:c534 Logitech, Inc. Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 05c6:9039 Qualcomm, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 008 Device 002: ID 0bc2:5071 Seagate RSS LLC Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub root@konoha:~# adb reboot bootloader root@konoha:~# fastboot devices root@konoha:~# grep 05c6 /etc/udev/rules.d/51-android.rules SUBSYSTEM=="usb", ATTR{idVendor}=="05c6", MODE="0666", GROUP="plugdev" #SUBSYSTEM=="usb", ATTR{idVendor}=="05c6", MODE="0666", GROUP="plugdev" root@konoha:~# cat /etc/group | grep plugdev plugdev:x:46:itachi root@konoha:~# I get the fastboot screen on Yureka device, but no luck with fastboot devices. (Click image to enlarge) " class="img-fluid rounded" style="max-width: 100%; height: auto; margin: 10px 0;" loading="lazy"> Some suggested that running fastboot as root user solved this. But that too didn't work for me. But for Redmi 2, I was successfully able to install TWRP recovery using fastboot, so that makes fastboot works, but not for Yureka. I am using Ubuntu 14.04.