Got the same error on a 7.4.2 install. Also tried another v8 install and got the errors but hitting retry a few times got it to install without the extra poral and the host account was given roper permissions so it's a bit of a random one.

Ok so I'm still struggling with this issue. Tried to install a fresh 8.0.3 site but it fails at 18% with:
[ERROR] DotNetNuke.Services.Upgrade.Upgrade System.Data.SqlClient.SqlException (0x80131904): Cannot find the object 'aspnet_Membership_GetUserByUserId', because it does not exist or you do not have permission.

I checked the web.config when I got the error and see the connection string was missing the ; after the password again like the other times this has happened. Not sure why it gets deleted during the install process?

I looked at the database and it seems all the tables and stored procs are there but when I look into the Users table it is empty so it seems that when I hit install it doesn't write any of the host account info into the database.

The site was in its own App Pool with no limits that would cause a recycle during the install.

Here is the full error I get during the installation (sorry its so long, it wont paste into a forum post so here is a link to the Community Exchange question):

 

http://www.dnnsoftware.com/answers/80...

So at the moment I cannot install any new DNN sites on my server. Any advice on this greatly appreciated as always!