Upgrading Drupal

I have 9 sites which I have downloaded drupal.
I loaded 5.3 a few weeks ago, and then just last week went to upgrade to 6.1 again via fantastico.
3 of them have this error - how can this be corrected, it does not give me the option to remove and try again.

Upgrade failed
www.domain1.org
The database dom1_drpl1 is not working properly and the creation of a database backup file has failed. Please contact the sysadmin for further assistance. Include this message for reference.

I just finished an upgrade fro 4.6.11 to 6.1. Amazingly (kudos!) things seem to be working so far for the most part. Unfortunately I have run across an incompatibility with the node paths and was wondering if there is a quick fix.

I was using the 4.6 rewrite engine so my node paths typically look like this:
http://my.site/node/view/111

Hi all,
maybe you can help me. After having many troubles with the update to more recent version of my 4.6.4. I really do not see any other option than to install fresh Drupal 6.1. and start from scratch with a new clean database.
I have database dump (done by PhpMyAdmin) of my old system 4.6.4 and I would like to ask if there could be any chance to import the nodes (all articles and its comments - nothing more) to the new 6.1 system once installed.
Thanks a lot for any advice.

I just upgraded today from 5.1 to 5.7, and that worked fine. So I tried the same method to upgrade to 6.2.

- Copied the 5.7 site to the test site. Changed sites/default/settings.php to point to the test database.
- Copied the 5.7 database to the test database.
- Put the site into admin mode, turned off all the non-core modules.
- Un-tarred the 6.1 stuff on top of the test site.
- Went to http://bna.xcski.com/update.php and got all these errors:

warning: pg_query() [function.pg-query]: Query failed: ERROR: adding columns with defaults is not implemented HINT: Add the column, then use ALTER TABLE SET DEFAULT. in /www/bna/drupal-6.1/includes/database.pgsql.inc on line 138.
user warning: ERROR: adding columns with defaults is not implemented HINT: Add the column, then use ALTER TABLE SET DEFAULT. query: ALTER TABLE cache ADD COLUMN serialized smallint NOT NULL default 0 in /www/bna/drupal-6.1/includes/database.pgsql.inc on line 684.
warning: pg_query() [function.pg-query]: Query failed: ERROR: adding columns with defaults is not implemented HINT: Add the column, then use ALTER TABLE SET DEFAULT. in /www/bna/drupal-6.1/includes/database.pgsql.inc on line 138.

Hi

I am trying to upgrade my existing Drupal 5.x site to Drupal 6.1, and this is what I get:

* user warning: Table 'MYSITE_drpl1.flood' doesn't exist query: ALTER TABLE flood ADD fid int NOT NULL AUTO_INCREMENT PRIMARY KEY in /home/MYSITE/public_html/drupal-6.1/modules/system/system.install on line 1438.
    * user warning: Can't DROP 'link'; check that column/key exists query: ALTER TABLE aggregator_feed DROP KEY link in /home/MYSITE/public_html/drupal-6.1/includes/database.mysql-common.inc on line 417.
    * user warning: BLOB/TEXT column 'url' used in key specification without a key length query: ALTER TABLE aggregator_feed ADD UNIQUE KEY url (url) in /home/MYSITE/public_html/drupal-6.1/includes/database.mysql-common.inc on line 403.
    * user warning: Table 'MYSITE_drpl1.flood' doesn't exist query: ALTER TABLE flood ADD INDEX allow (event, hostname, timestamp) in /home/MYSITE/public_html/drupal-6.1/includes/database.mysql-common.inc on line 434.
    * user warning: Duplicate entry '1-0' for key 1 query: ALTER TABLE locales_target ADD PRIMARY KEY (language, lid, plural) in /home/MYSITE/public_html/drupal-6.1/includes/database.mysql-common.inc on line 374.

Now I can't login to the site as administrator. I can't even display the site unless I change the settings.php to:

$update_free_access = FALSE;

Ok..so what happened was, once I was done adding my backup files to the directory, my cpu crashed. I was in the progress of upgrading from 5x to 6x. I had to restart my cpu and off course it was hell on earth from there. When I finally got the update.php file to work, I got so many error logs it was enough to drive me crazy. I just wanna go back to 5x. I'm in the process of doing that but 1. drupal wont even show with my domain. 2. I have the Site folder and files from Drupal 6x that for some odd reason I cannot delete.