Upgrading Drupal

I attempted to upgrade from 6.14 to 6.15, and got a long list of DB errors. Any ideas why this might happen?

I had been running Drupal 4.x for a number of years, and only updated minor updates. I was keeping busy adding on to the existing package, and hacking a little bit.

Recently, after my cron runs had stopped running (mainly for enotify emailing users), I started thinking about upgrading. Finding out that there wasn't any way to upgrade 4 to 6 (w/o upgrading to 5 and then 6), as well as that my server was set up for php4, I started looking at other groupware and cms and portal packages.

Hi,
Friend of mine convinced me to switch to Drupal. Then of course, he got too busy to help. So, I'm left with a new site that I'm not totally up on configuring. I'm learning more and more but there are some simple things I need to figure out and launch things thing. It's at dev.bluegenie.net

For one thing, I went and upgraded to 6.15. That was interesting. Looks like it mostly worked. However, my contact link on the very top menu, next to hom, is missing now.

I was trying to upgrade from drupal 5.x to drupal 6.15) .

At running update.php step, had a unrecoverable error;

user warning: Table 'mydomain_2inhomemedical.menu_router' doesn't exist query: DELETE FROM menu_router in /home/mydomain/public_html/2inhomemed/includes/menu.inc on line 2346.
user warning: Table 'mydomain_2inhomemedical.menu_router' doesn't exist query: INSERT INTO menu_router (path, load_functions, to_arg_functions, access_callback, access_arguments, page_callback, page_arguments, fit, number_parts, tab_parent, tab_root, title, title_callback, title_arguments, type, block_callback, description, position, weight, file) VALUES ('node', '', '', 'user_access', 'a:1:{i:0;s:14:\"access content\";}', 'node_page_default', 'a:0:{}', 1, 1, '', 'node', 'Content', 't', '', 4, '', '', '', 0, '') in /home/mydomain/public_html/2inhomemed/includes/menu.inc on line 2443.
...

(the error messages went for about 600 lines actually).

I believe I was following the steps as it's listed here: http://drupal.org/node/340073 .

1. I checked (using the update status module) and upgraded all the drupal 5.x modules to their latest 5.x versions before going on to the drupal 6.x stuff.
2. Then took a backup of the files and database.
3. Logged into the site with the user 1 account (made the site 'off-line' )
4. Switched the theme to Garland

I have just upgraded our site (on a test copy) to Drupal 6 from Drupal 5 and many important pages are giving 404s. Examples are /admin/user/roles and admin/user/permissions. These are both missing from the administration menus and give 404 errors (themed 404s) when I try to navigate to them directly. We're also missing pages that should be available for the modules I've reinstalled such as /coder and /admin/panels/panel-pages (and their menu items).

Hi everyone,

I have a question, it may be too dumb to you. However, I'm a bit scare when reading all the problems related to upgrading Drupal to the newest versions (of the same Drupal 4, 5 or 6). I understand that a site should be upgraded to the latest version.