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Ubuntu

Upgrade from 8.04 LTS to 12.04 LTS

make sure all updates are installed
```
apt-get update && apt-get dist-upgrade
```
reboot if you installed critical updates (like kernels, etc.)
```
reboot
```
clean up packages
```
apt-get autoremove
```
install upgrade manager
```
apt-get install update-manager-core
```
edit „/etc/update-manager/release-upgrades“
```
[DEFAULT]
Prompt=lts
```
start graphical ui
```
startx
```
run update-manager
```
update-manager
```