The best replacement for 12.1 is 11.6.

The best alternatives to 12.1 are rated as following:
★★★★★  11.6
★★★★★  13.3
★★★  ubuntu 11.10
★★  fedora 16
★★  11.4
★  12.2
  kubuntu 11.10

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12.1
11.6
13.3