that ppa has no builds for precise/maya
https://launchpad.net/~adamkoczur/+archive/gtk1.2for future reference the best way to troubleshot issues like this is to go directly to launchpad home page
https://launchpad.net/ and in the search box look for the ppa in question: this here is adamkoczur gives you a page like this
https://launchpad.net/+search?field.text=adamkoczur ; second result is relevant for our query because gtk1.2 is also in the error message; if we go to that page
https://launchpad.net/~adamkoczur/+archive/gtk1.2 we see that the last build was 86 weeks ago (so this tells us that this ppa is no longer maintained) and the releases supported are maverick, lucid and karmic

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