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You only need to successfully run the apt-key command once, which you did yesterday. Regardless, the reason it's giving you that error is the same reason as yesterday, it appears to be blocked by your firewall. That's why I suggested to use hkp://pgp.mit.edu:80 which appears to have worked for you. You can try removing everything in the lists directory sudo rm -fR /var/lib/apt/lists/* and then sudo apt-get update If you still get errors, consider perhaps changing your sources to a different mirror. On Sat, Feb 8, 2014 at 2:58 PM, wyey0755 <[log in to unmask]> wrote: > Hi, > I think there are some mistakes at the begining. when I input the following > command: > sudo apt-key adv --recv-keys --keyserver pgp.mit.edu 2649A5A9 > > It shows: > > Executing: gpg --ignore-time-conflict --no-options --no-default-keyring > --secret-keyring /tmp/tmp.ZfDvvCVmnG --trustdb-name /etc/apt//trustdb.gpg > --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg > --recv-keys --keyserver pgp.mit.edu 2649A5A9 > gpg: requesting key 2649A5A9 from hkp server pgp.mit.edu > ?: [fd 4]: read error: Connection reset by peer > gpgkeys: HTTP fetch error 7: couldn't connect: eof > gpg: no valid OpenPGP data found. > gpg: Total number processed: 0 > > > And I tried removing the files that are giving you the Hash Sum mismatch; > there still many other mismatch. > > Thanks > > zhiyong > > > At 2014-02-08 20:42:32,"Niels Bergsland" <[log in to unmask]> wrote: >>You can try removing the files that are giving you the Hash Sum mismatch >> >>For example: >> >>sudo rm >> /var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_raring_main_binary-i386_Packages >>/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_raring_main_source_Sources >>/var/lib/apt/lists/partial/cn.archive.ubuntu.com_ubuntu_dists_raring-updates_main_binary-i386_Packages >> >>then >> >>sudo apt-get update > > > -- Niels Bergsland Integration Director Buffalo Neuroimaging Analysis Center 100 High St. Buffalo NY 14203 [log in to unmask]