[racket] Upgrading from 5.3.6 to 6.1.1 without Ubuntu package

I installed Racket 5.3.6 from a .deb package via the Ubuntu Software
Centre. DrRacket just told me that a 6.1.1 update is available, but as a
.sh file, not a .deb package. If I run the .sh file, will it install over
5.3.6 or store the files in its own idiosyncratic set of directories?  Any
help appreciated as I would like to run Scheme R6RS.

Regards,
Hedley

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