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Fedora 14

“Fedora 14 (Laughlin)” is already running in my laptop. I have upgraded from v12 to v14.
The only issue was with the /boot disk space. In versions 13 and 14 the recomended /boot size is 500 Mb and in previous versions were 200 MB. If you want to upgrade your system and have the same problem within the /boot partition, follow the instructions:

# Create a file that takes up enough space that there is insufficient remaining disk space for preupgrade to download kernel and initrd.img. That means we need to fill up /boot. Here’s how to do that as root:

# dd if=/dev/zero of=/boot/preupgrade_filler bs=1M count=170

# Install the newest available version of image:Package-x-generic-16.pngpreupgrade.
# Run preupgrade from a command prompt or the Run Application dialog. Provide the requested password for root authorization.
# On the Choose desired release screen, enable unstable test releases.
# Choose Rawhide from the list of available upgrade targets, then click Apply.
# While downloading, preupgrade should warn that it failed to download installer data. Click quit for that.
# Next, change the amount of available disk space on the /boot partition by reducing the size of the /boot/preupgrade_filler file to 100MB. This should leave sufficient room for preupgrade to download the kernel and initrd.img but not enough room to download install.img. Once again, use the dd command:

# dd if=/dev/zero of=/boot/preupgrade_filler bs=1M count=100

# Re-run preupgrade. When prompted, click Yes to resume your upgrade.
# While downloading, preupgrade should warn that there wasn’t enough space to download install.img but it can be downloaded after reboot if you have a wired network connection. Click continue for that.
# When preupgrade is done don’t reboot immediately. Instead, remove the /boot/preupgrade_filler file and make sure your computer is connected to the network via an ethernet cable.

# rm /boot/preupgrade_filler

# Click reboot.

Laptop: DELL XPS M1330
Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00 Ghz
2GB shared3 Dual Channel 667MHz DDR2 SDRAM
160GB configured with 7200 RPM SATA hard drive
128MB NVIDIA® GeForce® 8400M GS

Source: http://fedoraproject.org

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