Guys,
You can set this thread to “solved”. After digging around, I found out that my 1.6.9 database had this at the start of “site_system_preferences” in the “exp_sites” table:
a:98:{s:15:"encryption_type";s:4:"sha1";s:10:"site_index";s:9:"index.php";s:9:"site_name";s:16:"Pål Degerstrøm";
That is my name in there, and I couldn’t change the text from either the control panel or the config file. So I manually entered the content to:
a:98:{s:15:"encryption_type";s:4:"sha1";s:10:"site_index";s:9:"index.php";s:9:"site_name";s:12:"helpfulhoops";
(While holding my breath, obviously…)
So my conclusion is that there must be one bug in EE 1.6.9: Changing site name in the control panel or config file doesn’t affect the contents of the “site_system_preferences” database entry.
Also, I suspect there must be one bug in the EE 2.1.0 upgrade wizard as well: Non-US letters cause errors (perhaps this is native to PHP’s serialize function?)— in my case, “å” and “ø”.
In any case, the upgrade seems to be working now. Thanks to the EE guys for helping out.