با سلام
من نسخه ی ۱۰.۱۰ رو نصب کردم و آپدیتش هم کردم ولی وقنی بعد چند روز خواستم دوباره آپدیت کنم و این دستور رو زدم
sudo apt-get update
و بعد گرفتن چند فابل به این خطا رسید
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2
W: Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/Release
W: Failed to fetch http://ppa.launchpad.net/loell/ppa/ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/loell/ppa/ubuntu/dists/maverick/main/binary-amd64/Packages.gz 404 Not Found
W: Some index files failed to download, they have been ignored, or old ones used instead.
ممنون میشم اگه کمک کنید