Apt-Get Update Returns the Following Errors..? Any Help Please?

apt-get update

Get:1 http://download.virtualbox.org/virtualbox/debian vivid InRelease 7,151 B

Ign:2 http://dl.google.com/linux/talkplugin/deb stable InRelease

Get:3 http://dl.google.com/linux/talkplugin/deb stable Release 2,141 B

Get:4 http://dl.google.com/linux/talkplugin/deb stable Release.gpg 916 B

Get:7 http://download.virtualbox.org/virtualbox/debian vivid/contrib amd64 Packages 1,573 B

Err:7 http://download.virtualbox.org/virtualbox/debian vivid/contrib amd64 Packages

Hash Sum mismatch

Get:8 http://download.virtualbox.org/virtualbox/debian vivid/contrib i386 Packages 1,578 B

Get:5 http://archive.linux.duke.edu/kalilinux/kali-security sana/updates InRelease 11.9 kB

Get:6 http://archive.linux.duke.edu/kalilinux/kali kali-rolling InRelease 30.5 kB

Get:10 http://dl.google.com/linux/talkplugin/deb stable/main amd64 Packages 778 B

Get:9 http://archive.linux.duke.edu/kalilinux/kali sana InRelease 20.3 kB

Get:11 http://dl.google.com/linux/talkplugin/deb stable/main i386 Packages 784 B

Get:12 http://archive.linux.duke.edu/kalilinux/kali-security sana/updates/main Sources 142 kB

Get:13 http://archive.linux.duke.edu/kalilinux/kali-security sana/updates/main amd64 Packages 411 kB

Get:14 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/main Sources 10.4 MB

Get:15 http://archive.linux.duke.edu/kalilinux/kali-security sana/updates/main i386 Packages 411 kB

Get:16 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/contrib Sources 64.4 kB

Get:17 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/non-free Sources 120 kB

Get:18 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/main amd64 Packages 13.9 MB

Get:19 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/main i386 Packages 13.9 MB

Get:20 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/contrib amd64 Packages 94.3 kB

Get:21 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/contrib i386 Packages 90.5 kB

Get:22 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/non-free amd64 Packages 147 kB

Get:23 http://archive.linux.duke.edu/kalilinux/kali kali-rolling/non-free i386 Packages 132 kB

Get:24 http://archive.linux.duke.edu/kalilinux/kali sana/main Sources 9,091 kB

Get:25 http://archive.linux.duke.edu/kalilinux/kali sana/non-free Sources 122 kB

Get:26 http://archive.linux.duke.edu/kalilinux/kali sana/contrib Sources 58.3 kB

Get:27 http://archive.linux.duke.edu/kalilinux/kali sana/main amd64 Packages 12.8 MB

Get:28 http://archive.linux.duke.edu/kalilinux/kali sana/main i386 Packages 12.8 MB

Get:29 http://archive.linux.duke.edu/kalilinux/kali sana/non-free amd64 Packages 163 kB

Get:30 http://archive.linux.duke.edu/kalilinux/kali sana/non-free i386 Packages 153 kB

Get:31 http://archive.linux.duke.edu/kalilinux/kali sana/contrib amd64 Packages 87.7 kB

Get:32 http://archive.linux.duke.edu/kalilinux/kali sana/contrib i386 Packages 86.5 kB

Fetched 75.2 MB in 44s (1,685 kB/s)

Reading package lists... Done

W: http://download.virtualbox.org/virtualbox/debian/dists/vivid/InRelease: Signature by key 7B0FAB3A13B907435925D9C954422A4B98AB5139 uses weak digest algorithm (SHA1)

N: Skipping acquire of configured file 'contrib/binary-1386/Packages' as repository 'http://download.virtualbox.org/virtualbox/debian vivid InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'main/binary-1386/Packages' as repository 'http://dl.google.com/linux/talkplugin/deb stable InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'main/binary-1386/Packages' as repository 'http://security.kali.org/kali-security sana/updates InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'contrib/binary-1386/Packages' as repository 'http://security.kali.org/kali-security sana/updates InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'non-free/binary-1386/Packages' as repository 'http://security.kali.org/kali-security sana/updates InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'main/binary-1386/Packages' as repository 'http://http.kali.org/kali kali-rolling InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'contrib/binary-1386/Packages' as repository 'http://http.kali.org/kali kali-rolling InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'non-free/binary-1386/Packages' as repository 'http://http.kali.org/kali kali-rolling InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'main/binary-1386/Packages' as repository 'http://http.kali.org/kali sana InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'non-free/binary-1386/Packages' as repository 'http://http.kali.org/kali sana InRelease' doesn't support architecture '1386'

N: Skipping acquire of configured file 'contrib/binary-1386/Packages' as repository 'http://http.kali.org/kali sana InRelease' doesn't support architecture '1386'

E: Failed to fetch http://download.virtualbox.org/virtualbox/debian/dists/vivid/contrib/binary-amd64/Packages.bz2 Hash Sum mismatch

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

MY SOUCRES.LIST FILE CONTAINS THE FOLLOWING:

deb http://http.kali.org/kali kali-rolling main contrib non-free

deb-src http://http.kali.org/kali kali-rolling main contrib non-free

deb http://http.kali.org/kali sana main non-free contrib

deb http://security.kali.org/kali-security sana/updates main contrib non-free

deb-src http://http.kali.org/kali sana main non-free contrib

deb-src http://security.kali.org/kali-security sana/updates main contrib non-free