ubuntu's ruby

gistfile1.txt

sudo apt-get install supercollider ruby2.0 libqscintilla2-dev ruby-dev cmake pkg-config g++

Package ruby2.0 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'ruby2.0' has no installation candidate

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apt search ruby |grep ruby
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ruby1.9.1/vivid 1.9.3.484-2ubuntu2 amd64
ruby1.9.1-dev/vivid 1.9.3.484-2ubuntu2 amd64
ruby1.9.1-examples/vivid 1.9.3.484-2ubuntu2 all
ruby1.9.1-full/vivid 1.9.3.484-2ubuntu2 all
ruby1.9.3/vivid 1.9.3.484-2ubuntu2 all
ruby2.1/vivid,now 2.1.2-2ubuntu3 amd64 [installed,automatic]
ruby2.1-dev/vivid,now 2.1.2-2ubuntu3 amd64 [installed,automatic]
ruby2.1-doc/vivid 2.1.2-2ubuntu3 all
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