PhuckFonix, (what a name!)
It is not an error with Slack, it is an error with your filesystem.
If you want to know where the message comes from, use a text editor to read /etc/rc.d/rc.S
# An error code of 2 or higher will require a reboot.
if [ $RETVAL -ge 2 ]; then
# An error code equal to or greater than 4 means that some errors
# could not be corrected. This requires manual attention, so we
# offer a chance to try to fix the problem in single-user mode:
so you got an errror code of 2 or 3, and so you did not get a choice about whether or not
your system rebooted or not.
Dont worry, the ext2 filesystem is very robust, and is not at all a bad choice for a home system (in my opinion). I use it, and have never lost data due to this filesystem type.
Ok, you will get errors every now and then, especially with a power cut, but it is rarely unrecoverable.
Let Slack reboot if you get that message, then you know your file system is being properly maintained.
Finally, there was a reply to your previous thread that said 'dont have lots of partitions, have just one + swap'. Well I think your setup of a separate /home and /usr is just fine. your error message has absolutely nothing to do with this.
good luck, tobyl