I posted before I saw Leo’s reply at any rate his method is probably better.

In my case, from the /gnu/store directory, I entered:

nano ./59pqd1d0ihqxx0i64yxk335vjmw78wmh-bzip2-1.0.6.tar.gz.drv

and at the end of the line, I changed url from http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz to https://github.com/past-due/bzip2-mirror/releases/download/v1.0.6/bzip2-1.0.6.tar.gz

That fixed the problem for me.

> On Nov 2, 2018, at 12:34 PM, Anthony Eslick <are0011@uah.edu> wrote:
> 
> I have been having a hard time getting guixsd installed on my x200 the past few days. I am running the command "guix system init /mnt/etc/config.scm /mnt --substitute-urls="https://berlin.guixsd.org <https://berlin.guixsd.org/>"" and everything seems to be working but after a couple hours into the install I keep getting this message
> 
> sha256 hash mismatch for output path '/gnu/store/bjpalrv9f49d2k40p7ga0y6dwdys9w5j-bzip2-1.0.6.tar.gz'
> expected: *****************************************
> actual: *********************************************
> cannot build derivation: ***************************
> *
> *
> *
> 
> is there something in the guix system init command that I am leaving out?