i can't update ubuntu

[anas.emad at gmail.com]

hi everybody here

i have problem with update ubuntu

see screenshot in attachment


 and try to update by terminal *sudo apt-get update*

found this

Fetched 145kB in 28s (5,033B/s)

Reading package lists... Done
N: Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/'
as it has an invalid filename extension
W: A error occurred during the signature verification. The repository is not
updated and the previous index files will be used. GPG error:
http://linux.dropbox.com maverick Release: The following signatures were
invalid: NODATA 1 NODATA 2

W: Failed to fetch http://linux.dropbox.com/ubuntu/dists/maverick/Release

W: Some index files failed to download, they have been ignored, or old ones
used instead.


so what can i do ?

______________________________________
with my love ,
Anas Emad
Web Designer

*my phone : 0144 27 49 47*

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Mail : anas.emad at gmail.com
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