I am currently running debian 8 jessie as my linux distro, and have been following this link to install HHVM https://docs.hhvm.com/hhvm/installation/linux the first two lines I have successfully carried out, however when I try to do a sudo apt-get update I get this error: 

> W: Failed to fetch http://dl.hhvm.com/debian/dists/jessie/InRelease 
> Unable to find expected entry 'main/binary-mipsel/Packages' in Release
> file (Wrong sources.list entry or malformed file)
> 
> E: Some index files failed to download. They have been ignored, or old
> ones used instead.

Here is the whole trace: 

 Get:1 http://security.debian.org jessie/updates InRelease [63.1 kB]
 Ign http://ftp.uk.debian.org jessie InRelease
 Hit http://ftp.uk.debian.org jessie-updates InRelease
 Ign http://deb.flowworld.com flowsdk InRelease
 Get:2 http://dl.hhvm.com jessie InRelease [2,106 B]
 Hit http://ftp.uk.debian.org jessie Release.gpg
 Ign http://deb.flowworld.com flowsdk Release.gpg
 Hit http://ftp.uk.debian.org jessie Release
 Hit http://deb.flowworld.com flowsdk Release
 Ign http://deb.flowworld.com flowsdk/main mipsel Packages/DiffIndex
 Hit http://deb.flowworld.com flowsdk/main mipsel Packages
 Hit http://ftp.uk.debian.org jessie-updates/main Sources
 Get:3 http://ftp.uk.debian.org jessie-updates/main mipsel Packages/DiffIndex [3472 B]
 Get:4 http://security.debian.org jessie/updates/main Sources [134 kB]
 Get:5 http://ftp.uk.debian.org jessie-updates/main Translation-en/DiffIndex [1,20 B]
 Ign http://deb.flowworld.com flowsdk/main Translation-en_GB
 Hit http://ftp.uk.debian.org jessie/main Sources
 Hit http://ftp.uk.debian.org jessie/main mipsel Packages
 Hit http://ftp.uk.debian.org jessie/main Translation-en
 Ign http://deb.flowworld.com flowsdk/main Translation-en
 Get:6 http://security.debian.org jessie/updates/main mipsel Packages [237 kB]
 Get:7 http://security.debian.org jessie/updates/main Translation-en [132 kB]
 Fetched 573 kB in 31s (18.1 kB/s)
 W: Failed to fetch http://dl.hhvm.com/debian/dists/jessie/InRelease Unable to ind expected entry 'main/binary-mipsel/Packages' in Release file (Wrong sourceslist entry or malformed file)
 
 E: Some index files failed to download. They have been ignored, or old ones use instead.

here is my sources.list file:

 deb http://ftp.uk.debian.org/debian/ jessie main
 deb-src http://ftp.uk.debian.org/debian/ jessie main
 
 deb http://ftp.uk.debian.org/debian/ jessie-updates main
 deb-src http://ftp.uk.debian.org/debian/ jessie-updates main
 
 deb http://security.debian.org/ jessie/updates main
 deb-src http://security.debian.org/ jessie/updates main

and here is the file running the command `echo deb http://dl.hhvm.com/debian jessie main | sudo tee /etc/apt/sources.list.d/hhvm.list`

 deb http://dl.hhvm.com/debian jessie main