Ubuntu: Buffer I/O error on device sr0 logical block

Most of the time this error occurs that is a bad disk or a bad drive (or a bad cable).
Ubuntu 8.10 seams (from own experience and google) to be commonly affected by this.

You can try the following (I try them in this order)

  • If you only get buffer errors and no CRC errors, just try and wait (a few minutes) It might still be possible to install
  • Try another installation CD [from the same installation image] – if this works, then the other disk is bad
  • Try to swap out the cable to the drive (if you have a ribbon cable use one with 80 connectors, not one with 40)
  • Try to swap out the drive
  • Try another installation CD [from another installation image, old version, other dist, windows] – if this works then there is an issue with the installation image – there might be an issue worth reporting

If all this fails or you wish to install the version you have, then using a usb stick to install the image might be a good idea.

Magento: Installing on a debian server

To install magento on a fresh server use the following.

  • Install apache, mysql and PHP5 “$ apt-get install apache2 mysql-server php5 php5-mysql php-soap php5-mcrypt php5-curl php5-gd”
  • Edit the vhost config for the apache site [/etc/apache2/sites-enabled/000-default]
    • Verify that “AllowOverride” is set to All for the magento directory
  • Make sure that mof_rewrite is loaded; use “$ a2enmod rewrite” and then reload apache2
  • Edit /etc/php5/apache2/php.ini
    • “memory_limit” [the manual says] no less than 256Mb (preferably 512)
    • “max_execution_time” [this is the max time that a script may be left running] SOAP requests take time, so make suer it is at a reasonable time
    • “upload_max_filesize” Set this to a size that is reasonable depending on what you plan to upload (manuals might be large)
    • “post_max_size” Set this to a size that is reasonable depending on what you plan to post (manuals might be large); also make sure that the value and the modifier is correct (so that it says 8M and not just 8 for instance)
    • “display_errors” Set to Off
    • “log_errors” Set to On
    • “error_log” Set to a file that you will be able to find [if you wish to have it in a subdir; create that as root and give it permissions as apache log dir]
  • download magento (lastest version from magento
  • Upack it (I choose bzip2 format) “$ tar -jxvvf magento-downloader-” and make sure the files gets put in the directory you wish
  • Some directories have to be writable to the webserver (and all subdirectories, where there are)
    • var
    • var/.htaccess
    • app/etc
    • media
  • If you are using the downloader installation
    • “$./pear mage-setup .”
    • “$./pear install magento-core/Mage_All_Latest”
    • “$rm -rf downloader/pearlib/cache/* downloader/pearlib/download/*”
  • Create database and database user [this is to do it manually via mysql console]
    • “$mysql -uroot -p”
    • “mysql> create database magento;”
    • “mysql> use mysql;”
    • “mysql> INSERT INTO user (Host,User,Password) VALUES (‘localhost’, ‘magento’, PASSWORD(‘password’));”
    • “mysql> GRANT ALL ON magento.* TO ‘magento’;”
    • “mysql> FLUSH PRIVILEGES;”
    • “mysql> exit”
  • Go to the webserver and complete the installation
  • If you get stuck on the configuration page [that you get back to it even after adding correct information]:
    • Check “AllowOverride” in the apache config.
    • Check “post_max_size2 in the php.ini [also check so that the value is either absolute or has a modifier; 8 means 8 bytes while 8M means 8Mb]

Samsung U600 install jar directly (without ota download)

This is likely to work on other Samsung devices as well, when I get around to it I will try it on some more devices.
1. Transfer the .jad and .jar files to the phones memory to the ‘Other Files’ folder.
You can transfer the files from Samsung PC Studio’s ‘Phone Explorer’, or just transfer it straight to the memory card and move it to ‘Other Files’ from the phone’s menu.
(If you don’t have a .jad file, you can download ‘Jad Maker’ (google) and make a new one)

2. Exit all menus and type in this code: *#9998*4678255#.
You should now get a ‘Activated’ message. Java install is enabled.

3. Go to the ‘Other Files’ folder and select the .jad file (should be 1kb).
Press ‘Options’ (left soft key) and you should get a ‘Do you want to install’ question.
Press ‘Yes’ to install.

4. To deactivate Java install, simply type the same code again.
You should now get a ‘Deactivated’ message.