Thursday, November 18, 2010

How to fix broken grub when you have /boot on different partition.

I recently upgraded my Ubuntu Desktop (64 bit) to 10.10. This upgrade broke my bootup and started throwing me to initramfs prompt.
After googling a bit and trying unsuccessfully instructions from here I found a simple solution.

I have a slightly differnt setup than what Grub assumes (boot and root on same partition).
I have my boot partition on (hd0,msdos3) and root partition on (hd0,msdos5). Grub assumed that both are on (hd0,msdos3) so added the root entry pointing to the same and tried to use kernel and initrd images from root.

To fix the issue all I had to do was use live USB key to boot into linux and mount partition (hd0,msdos3) and edit grub/grub.cfg to set root=(hd0,msdos5) and load kernel from (hd0,msdos3)/ and same for initrd.

This simple fix worked after lot of unsuccessful attempts to install grub and let it configure the boot configuration.

I am pretty sure this is going to break once the new kernel version is updated in future by update-manager. However, now atleast I know what to expect and how to fix with this post.

I would be happy to try suggestion on how to fix it in better way than what I did.

Friday, May 21, 2010

Finally sorted my duplicate photo collection.

I figured out recently that I have accumulated 21GB of photos and movie clips from my small Pentax S4 camera and was wondering what should I do to remove the duplicates. Having searched google for linux photo management softwares I installed digiKam (from KDE) and it took almost half an hour to catalog them and used fuzzy search (I think I used the right term) to find duplicates and shocked me with many photos with as many as 11 copies in different folders from backups.

I took the painful way of manually cleaning them from duplicates list in digiKam and spent almost 1 whole day in all to do this. In the end I was expecting my original collection to be clean but it wasn't but digiKam showed it clean. So thought of deleting and recreating new album (biggest mistake) and was shocked again by it found all the duplicates and then I realized when you add an album it does the whole copy of the collection and edits the copy. (this is really annoying for me but it may there for good reason of not loosing stuff accidentally) Having said all this I do think it's a very good photo management application.

I was no way ready for the same exercise again so back to Google again and found another solution fslint which shows duplicate files but is still manual work to remove duplicates.

Further search gave me wonderful command on one of the forums using fdupes which did a very good job for me. I was bit skeptical in first place with fear to loose some files so ran it without -d option like
fdupes -r photos/clean_album and reviewed output and was happy with the listing so when ahead and used it as suggested by forum
yes 1 | fdupes -rd photos/clean_album and I had my 95% or duplicate removal work done. (I wish I should have used it in first place) Rest of the work was to clean up using Digikam and then flatten them into one directory where I have some name conflicts which I used as my blog name low-tech approach and added prefixes to avoid clashes.

End result 21GB is now reduced to 8.5GB.

I think I should be more careful going forward about duplicates and backups.

EDIT: Another note is I did miss the avi clips when I did manual cleanup using digiKam but fslint and fdupes sorted those out as well.

Wednesday, January 6, 2010

How to install Oracle xe on Ubuntu 64 bit?

I wanted to install Oracle Xe on Ubuntu 64bit and was faced with the problem that the debian package that Oracle has with free edition is 32 bit so googled a bit for more information and found a link that helped me to configure it.

Here is a link to keep note of :