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I know this problem has been discussed here (http://www.iredmail.org/forum/topic6110 … -1404.html)  but it is locked.

System Info:
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bp@mailserver:~/Download/iRedMail-0.8.7$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:    14.04
Codename:    trusty
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bp@mailserver:~/Download/iRedMail-0.8.7$ uname -a
Linux mailserver 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
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I am trying to install iRedMail iRedMail-0.8.7 but get the following errors:

bp@mailserver:~/Download/iRedMail-0.8.7$ sudo bash iRedMail.sh
< SKIP > Function: check_new_iredmail.
< INFO > Resynchronizing the package index files (apt-get update) ...
Err http://us.archive.ubuntu.com trusty InRelease
 
Err http://security.ubuntu.com trusty-security InRelease
 
Err http://us.archive.ubuntu.com trusty-updates InRelease
 
Err http://us.archive.ubuntu.com trusty-backports InRelease
 
Err http://security.ubuntu.com trusty-security Release.gpg
  Could not resolve 'security.ubuntu.com'
Err http://us.archive.ubuntu.com trusty Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com trusty-updates Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com trusty-backports Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dis … /InRelease 

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dis … /InRelease 

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dis … /InRelease 

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists … /InRelease 

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dis … elease.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists … elease.gpg  Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dis … elease.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dis … elease.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
< INFO > Fetching source tarballs ...
< INFO > + 1 of 6: http://iredmail.org/yum/misc/iRedAdmin-0.3.3.tar.bz2
< INFO > + 2 of 6: http://iredmail.org/yum/misc/phpldapadmin-1.2.3.tgz
< INFO > + 3 of 6: http://iredmail.org/yum/misc/phpMyAdmin … es.tar.bz2
< INFO > + 4 of 6: http://iredmail.org/yum/misc/iRedAPD-1.4.3.tar.bz2
< INFO > + 5 of 6: http://iredmail.org/yum/misc/phpPgAdmin-5.1.tar.bz2
< INFO > + 6 of 6: http://iredmail.org/yum/misc/roundcubemail-1.0.1.tar.gz
< INFO > Validate packages ...md5sum: misc/iRedAdmin-0.3.3.tar.bz2: No such file or directory
md5sum: misc/phpldapadmin-1.2.3.tgz: No such file or directory
md5sum: misc/phpMyAdmin-4.2.0-all-languages.tar.bz2: No such file or directory
md5sum: misc/iRedAPD-1.4.3.tar.bz2: No such file or directory
md5sum: misc/phpPgAdmin-5.1.tar.bz2: No such file or directory
md5sum: misc/roundcubemail-1.0.1.tar.gz: No such file or directory
md5sum: WARNING: 1 line is improperly formatted
md5sum: WARNING: 6 listed files could not be read
misc/iRedAdmin-0.3.3.tar.bz2: FAILED open or read
misc/phpldapadmin-1.2.3.tgz: FAILED open or read
misc/phpMyAdmin-4.2.0-all-languages.tar.bz2: FAILED open or read
misc/iRedAPD-1.4.3.tar.bz2: FAILED open or read
misc/phpPgAdmin-5.1.tar.bz2: FAILED open or read
misc/roundcubemail-1.0.1.tar.gz: FAILED open or read
    [ FAILED ]
< ERROR > MD5 check failed. Script exit ...

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I also tried changing the permission  to execuateble on iRedMail.sh but got the same error.