Upgrading Drupal

Hi,

I've upgraded from 5.x to 6.x.
All posts are shown in the list (/admin/content/node). If I try to open those ones, that have been published at last, I am getting a 404.

Why? What could be the issue?

I wanted to upgrade from 6.17 to 6.19 and I am experiencing on my tests sites weirds behaviors that are so strange they must have a common cause.

Since I did not see something similar around I am posting there to gather similar experiences if they exists or get some inspiration before continuing to dig in code, logs and module hell.
I would help me separate what could come from my installation rather than from drupal proper.

Anyway since I upgraded I have DOZENS of

Notice: Undefined variable: output in sky_menu_local_tasks()  .....
Notice: Undefined variable: base_url in include()
Notice: Undefined property: stdClass::$attributes in include() (
Notice: Undefined index: skinr in include() (

I also had loads of undefined constant like so
Use of undefined constant DATE_FORMAT - assumed 'DATE_FORMAT' in include_once
where the constant was defined in a bad way define("aConst","ConstValue"); (missing ")

The skinr module and the sky theme throw lots of them but probably because they cross the same code paths again and again while composing the page.

All of them are Notice so I suspect some module or some code did something to the warning level, revealing bad practices that there already there but I don't know php deep enough to pinpoint the culprit.

I have managed to install this upgrade and I had a horrible time of it but after I got it figured out, it only took about 10 min.

Here is what I had to do.

I made sure my site and all it's modules are up to date and you run update.php BEFORE I did this upgrade.
After my site was updated, I did a database backup (very important).

I then deleted everything but themes, sites, .htaccess, robots and non-Drupal related stuff and then just uploaded the new package and ran update.php again.
Of course there were be modules to update - my site works fine now.

hi,

i've looked here:
http://drupal.org/node/545930
http://drupal.org/node/881736

i'm working on migrating a Drupal 5x to make it a 6x site. the hosting company started the migration by creating a D6 folder with the new source code. (the root folder, which the public sees, has been kept at D5.) The idea is i develop the 6x site until it is ready to replace the root.

Hello
I tried to upgrade from 6.17 to 6.19 following these steps:
1) I Download the 6.19 version of drupal
2) I unzip the tar.gz archive
3) I deleted from the version 6.19 sites folder and the files .htaccess, robots.txt
4) I made the backup of the site and database
5) I put the site offline
6) I upload version 6.19
7) I launch www.mysite.com/update.php

I just completed the upgrade from 6.17 to 6.19 and while the update process seemed to go smoothly, I now get one of two errors when I try to access the Available Updates report at /admin/reports/updates:

1. Unable to fetch any information about available new releases and updates.
This one gives me no additional information at all and occurs when I click the Check Manually link (/admin/reports/updates/check)

2. Failed to fetch available update data.
This displays for every module but it does report that my Drupal core is up-to-date.