GPG error while apt-get update or upgrade - Raspberry Pi Forums

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i'm new raspberry pi, past 2 days i'm getting on these annoying error, solution . :x

ignoring file 'rpimonitor' in directory '/etc/apt/sources.list.d/' has no filename extension
w: gpg error: http://ftp.debian.org experimental release: following signatures couldn't verified because public key not available: no_pubkey 8b48ad6246925553 no_pubkey 7638d0442b90d010
w: ignoring provides line depcompareop package python-cffi-backend-api-max
w: ignoring provides line depcompareop package python-cffi-backend-api-min
w: ignoring provides line depcompareop package python3-cffi-backend-api-max
w: ignoring provides line depcompareop package python3-cffi-backend-api-min

where did rpimonitor file come , what's in it?

edit: sorry, red herring , not actual problem (it's separate problem).

provide content of /etc/apt/sources.list , /etc/apt/sources.list.d/* explanation modifications.


raspberrypi



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