Elgg installation process

Hi could anybody help me,

 

I am trying to install elgg, when I open it in my browser I get the error: dit you install composer install?

I tried installing the composer by using the commands:

sudo apt install composer --> when I do this  I get the error that during the update some files could not be fetched 

what I see:

err: 1 http://security.ubuntu.com/ubuntu genial security Inrelease

temporary failure resolving 'security.ubuntu.com'

err: 2 http://nl.archive.ubuntu.com/ubuntu genial InRelease

temporary failure resolving 'nl.archive

etcetera, all mentioning InRelease... 

 

i am kind of new to Ubuntu and I don't know a lot about all the different commands you can use, if often just google them, is there anyone who could help me out..?

 

 

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