The error

rpmlib(X-CheckUnifiedSystemdir) is needed by filesystem

came about when trying to upgrade from FC16 ( Fedora Core 16 ) to Fedora Core 19 ( FC19 ).  There is a fundamental filesystem change that has been done impacting every rpm on the new Fedora Linux distribution.  More towards the error, it came about when trying to upgrade rpm using yum upgrade rpm.  There was no simple solution.  It was a catch-22 situation.  We needed filesystem FC19 to get rpm FC19 upgraded.  However, we needed filesystem FC19 in order to get rpm FC19.  This is the case when upgrading to FC17 and up.  

What we needed to do was to obtain a number of FC19 packages on our Fedora Core 16 system then unpackage them manually and copy them over.  Here are the basic steps of doing this however we would also recommend reviewing the above link for more on the entire upgrade process.  One important note to keep in mind is that this will get you past the mentioned error but you'll likely see others you'll need to resolve.  This is also not an easy fix.  Before you try this solution, please visit the Fedora Howto Page to upgrade from  FC16 to see for alternative ways.  If that fails, come back here.

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(continued from here)

[root@moto F13toF18]# rpm -aq|head
liboil-0.3.16-5.fc15.i686
arj-3.10.22-13.fc15.i686
perl-POE-1.289-6.fc16.noarch
autocorr-sv-3.4.6.2-1.fc16.noarch
python-iniparse-0.4-3.fc15.noarch
unique-1.1.6-5.fc16.i686
kde-i18n-Finnish-3.5.10-17.fc18.noarch
finger-0.17-43.fc15.i686
hyphen-it-0.20071127-6.fc15.noarch
libXrender-devel-0.9.6-2.fc15.i686

[root@moto F13toF18]#
[root@moto F13toF18]#

Which is perfect and we're at FC19 with RPM and glibc and libdb.  Now time to see if yum works so we try and get the FC19 repos this time to complete this job.  First we cleanup the old rpm's with yum clean all which worked perfectly.  Next check free space:

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What if you had created a post half a decade ago, had it dropped from the index (Or at least it wasn't listed in any results.) after another unrelated site copied your entry then Google lists that copied (literally copy + paste) page on the first page of search results?  I wouldn't think this can happen through Google but apparently it can.  ( We rather find this very interesting that it's possible then anything else. 🙂  )

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Nuking your permissions problems on a server is typically just as bad as wiping out the server.  Before you start trying to compare permissions server to server based on what they were elsewhere on a similar host, take a backup of the already misconfigured host.  Yeah your system is already messed up but at least you can get back to square one if something goes haywire:

mksysb -ip /backup/folder/$(hostname).mksysb;  # AIX

The steps here were forwarded to me from a good colleague of mine and how he went about solving this one:

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Trying to tweak my RSS feeds off the site, I encounter this error:

This page contains the following errors:
error on line 2 at column 1: Extra content at the end of the document
Below is a rendering of the page up to the first error.

Looking at the source code, we see this result:

<br />
<b>Fatal error</b>:  Unknown: Cannot use output buffering in output buffering display handlers in <b>Unknown</b> on line <b>0</b><br />

Which isn't good at all.  Turns out, all we need to do is this to resolve it:

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Was struggling to increase the number of RSS feeds displayed for our readers.  However, it proved less then intuitive until I stumbled upon the correct setting in the Admin Panel of WordPress.  The one setting you need is under Admin – Settings – Reading:

And increase this number to what you need.  (You may now stop playing with the scroller when ready.)

Cheers,
TK

So I had an established connection on my router that didn't look like it belonged.  I didn't recognize the device and it wasn't pingable so it was probably a stale old connection.  In this case it was one of my mobile devices which went offline sometime back but didn't close the connection.  On most systems I can use LSOF to check on the open files from the PID that's listed from netstat but lsof isn't installed on DD-WRT:

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This is a simple howto on generating keys.  For this post, we'll simply create a one way auto-login no passphrase key pair for use between one of our systems and our router.  However, we won't allow the router to autologin to the hosts.  First step in this is to generate the keys however do check if you already have an id_rsa and id_rsa.pub files so you don't overwrite them:

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On the other hand, if you're getting this sort of issue:

# smbclient //192.168.0.14/I/
Enter root's password:
Domain=[WINPC_NAME] OS=[Windows 5.1] Server=[Windows 2000 LAN Manager]
tree connect failed: NT_STATUS_BAD_NETWORK_NAME
#

Then tips on this Samba / CIFS Connectivity page may help.

Regards,
TK

If you're getting this sort of issue:

$ smbclient //192.168.9.9/I$  /mnt/winshare-I -o rw,user="MeUser",password="somepassword" -v
Domain=[WINPC_NAME] OS=[Windows 5.1] Server=[Windows 2000 LAN Manager]
tree connect failed: NT_STATUS_ACCESS_DENIED
$

Then follow us on our Samba / CIFS Connectivity page for the resolution to the issue.  Hope this helps out!

Regards,
TK