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General discussion

Can't run ubuntu from live cd.

by jordan14petersen / March 13, 2007 10:36 AM PDT

When I try to boot ubuntu from a cd it gets through the part where it says Ubuntu and has the moving bar underneath, then the screen goes black for a while. Then the error message "Buffer I/O error on device sr0 logical block #########". Does anyone know what this error means and how to fix it? Thank You.

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Read error
by 3rdalbum / March 13, 2007 6:54 PM PDT

What speed did you burn Ubuntu at? You should use good quality CD-Rs or CD-RWs, burnt at below 8x speed.

The error message you describe sounds like some badly-burnt data on the disc.

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Read error
by jordan14petersen / March 13, 2007 11:40 PM PDT
In reply to: Read error

I tried burning another cd-r at 4x and it said the data was in a bad compressed format. The original cd-r worked on a different computer, just not on mine. Any ideas. Thank you.

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Bad download
by clsgis / March 15, 2007 3:59 AM PDT
In reply to: Read error

Either your CD drive is bad or the ISO file you downloaded is bad.

Apparently Internet Explorer on MS-Windows has a hard time downloading a large file correctly. Or maybe it just doesn't like ISO files that begin with a Linux loader signature. It's proprietary code so nobody knows. But a lot of people have this problem.

Get a friend with a trustworthy system to download and burn the CD for you. Or buy one from one of the many vendors listed at Most of them sell a complete assortment. Some will do custom downloads. The going rate for a live CD is a dollar or two plus shipping. The Ubuntu organization will send you one for free.

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speaking of downloading
by clsgis / March 16, 2007 3:01 AM PDT

I don't use a Web browser to download software. I use "GNU wget" from the Free Software Foundation. It's a "command line" utility with lots of options. Wget preserves the time stamp on the downloaded file, so you can tell when the file was created, not when you finished downloading it. It's got a -c option to continue an interrupted download where you left off, and it works even if you continue from a different mirror source. It's got a --limit-rate= option so you can tell it not to choke your bandwidth while you do other stuff. It's been ported to MS-Windows and there's an add-on graphical user interface.

Most software worth downloading is distributed with an MD5 checksum. You download the software file, calculate the MD5 checksum at your end, and compare it against the MD5 sum at the source. This will protect you from bad downloads. If you check the sum at the original source it will protect you from a corrupted copy on a mirror site. It's really hard to make an altered version of a file with the same MD5 sum *and* exactly the same length, so you can be pretty sure you're not getting a fake. On GNU/Linux you have an "md5sum" program for calculating the checksum at your end. On MS-Windows there are lots of programs to do it.

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