The best replacement for ubuntu is windows.

The best alternatives to ubuntu are rated as following:
★★★★★  windows
★★★★  fedora
★★★  windows 7
★★★  opensuse
★★★  kubuntu
★★★  debian
★★  mint
★★  mac
★★  windows xp
★★  apple
★★  ozos
★★  linpus
★★  microsoft windows
★  centos
★  xubuntu
★  vista
★  linux
★  redhat
★  suse
★  lubuntu
★  ubuntu server
  linux mint
  xp
  mandriva
  osx
  chrome os
  debian server
  arch
  gentoo
  windows 8
  centos server
  windows vista
  rhel
  freenas
  red hat
  knoppix
  linspire
  linux os
  mepis
  windows server 2008
  mac os x

Your alternative for ubuntu is not listed? Suggest!
Speaking about ubuntu, one probably shouldn't forget about grub.

Other search terms related to ubuntu and their ratings are:
★★★★★ grub
★★★★ kde
★★★ gnome
★★★ beryl
★★ vista
★★ mate
★★ xfce
★ touch screen
★ compiz
★ installing
★ bootcamp
★ openbox
★ mouse
★ install
★ xgl
★ ssd
uefi
swap partition
partition
vmware
fluxbox
login
windows partition
parallels
partitioning
zfs
enlightenment
You have in mind a companion for ubuntu and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ubuntu in all years. Click on graph for more.
ubuntu
windows
fedora