rasbian – Kev's Development Toolbox

January 17, 2020January 17, 2020

Raspbian error: “The following signatures couldn’t be verified because the public key is not available”

I couldn’t do a ‘sudo apt-get update’ on my Pi 3 running Raspbian as I got this error:

Fetched 74.9 kB in 31s (2,381 B/s)                            Reading package lists... Done
W: GPG error: http://security.debian.org jessie/updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906 NO_PUBKEY AA8E81B4331F7F50

To import the missing keys:

sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-key AA8E81B4331F7F50

sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-key 9D6D8F6BC857C906

Tips from here.

April 11, 2016

Raspbian – force a fsck on reboot

Neat tip to force a fsch on the root partition on next reboot (from: http://raspberrypi.stackexchange.com/questions/3289/checking-sdcard-for-errors-unmount-problem )

sudo touch /forcefsck

February 3, 2016

How to reset your password on Raspbian

What not to do: reset your password before you change/setup your keyboard locale, use punctuation characters in your new password, and then change the locale. Yeah, that’s not going to work. Now I don’t know where some of the characters moved to 🙂

I’m going to leave this post right here for future reference.

Update 2/3/16: after I edit the cmdline.txt and booted to a shell, passwd gave me this error:

passwd: Authentication token manipulation error
passwd: password unchanged

Further down the post, this recommendation to remount / solved my issue:

mount -rw -o remount /

Then I did passwd and the change worked this time.