How to convert jpg files to one PDF?

1. Install imagemagick
sudo aptitude install imagemagick
2. Go to directory contains your jpegs and type the following command:
convert *.jpg foo.pdf
3. Make fun :)

Routine check of disks

Nearly all Ubuntu users know, that every 30 boots their system performs what is know as an "fsck" to make sure your hard drive has no errors. If you go through periods of frequent rebooting, these checks can become annoying.

To change how often these boot up checks occur, run this command in a terminal:
sudo tune2fs -c 50 /dev/hda1
where 50 is max number of mounting patrition without error checking and /dev/hda1 is checking partition.

Make fun :)