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I'm a newbie, trying to connect a gps to my raspberry pi 3 bit. After rebooting I can't get any further, and receive the message
End Kernel panic - not syncing: VFS: Unable to mount roof fs on unknown-block(0,0)
I'm trying to use the rescue system but every time I using a sudo command It says sudo: not found.
Your SD card is faulty, or at least the data that's on it is flawed/has issues.
Try burning your OS image (Raspbian) on the SD card
If that doesn't work, try another SD card.
sudocommand sits on the root fs which you are unable to mount. – Dmitry Grigoryev Mar 11 '19 at 10:14