Since I need to develop an application on Oracle, I tried to install Oracle XE on my laptop. Their installation process is quite straightforward, though after you configure it once through their "installer", you can't reconfigure it through it. The installation went smoothly (or so I thought):
Starting Oracle Net Listener...Done Configuring Database...Done Starting Oracle Database 10g Express Edition Instance...Done Installation Completed Successfully. To access the Database Home Page go to "http://127.0.0.1:8079/apex"
except that accessing the "database homepage" (a local webserver provided by the database server so that you can easily interact with it) wouldn't work.
After a lot of digging around, I discovered that the "listener" was failing to start (the above message doesn't really look like anything failed), and got at the error message in /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/network/log/listener.log (logging to /var/log would have been far too obvious).
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE))) TNS-12555: TNS:permission denied TNS-12560: TNS:protocol adapter error TNS-00525: Insufficient privilege for operation Linux Error: 1: Operation not permitted
And the cause of this failure was that I had already installed oracle XE on this machine a few months ago, and if you uninstall (purge) the package it seems like it leaves some junk in /var/tmp/.oracle
This caused the sEXTPROC_FOR_XE file in that directory (left from my previous installation) to have a bad user/group. Thanks to Oracle for their very clear error messages...
Firefox 3 is great. But there is one minor change which annoyed me: those new arrows next to each folder of the bookmarks toolbar. It takes up a lot of space for nothing, preventing all my folders to appear within the width of my screen. Luckily, there is a way to hide them:
#> cd ~/.mozilla/firefox/DefaultUser/chrome #> cp userChrome-example.css userChrome.css
edit userChrome.css with your favorite text editor:
#> vi userChrome.css
add the following line:
#PersonalToolbar .toolbarbutton-menu-dropmarker { display: none !important; }
(found in http://ubuntuforums.org/showthread.php?t=732134 )
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