overwrite existing os on hdd

files/preseed/ubuntu.seed

@@ -109,7 +109,7 @@ d-i grub-installer/only_debian boolean true
 
 # This one makes grub-installer install to the MBR if it also finds some other
 # OS, which is less safe as it might not be able to boot that other OS.
-d-i grub-installer/with_other_os boolean true
+d-i grub-installer/with_other_os boolean false
 
 # copy setup stuff
 ubiquity    ubiquity/success_command string cp -r /cdrom/setup /target/opt/ && cp -r /cdrom/heyalter /target/opt && chmod -R u+rwx,go-w,go+rx /target/opt/* && chmod u+s /target/opt/setup/setuproot.sh /target/opt/setup/cleanuproot.sh /target/opt/setup/54KernelDebs/changeTo54KernelOffline.sh && echo 'schule ALL=(ALL) NOPASSWD: ALL' > /target/etc/sudoers.d/schule && chmod 440 /target/etc/sudoers.d/schule