what does this error mean?

[John Dangler]

[snip]

So according to "dlocate" ( a handy utility for finding which package
contains particular installed files) ,  this tells me is that you need to
install

libgtk1.2

(This is the "old" gtk - there are still some programs that use it )

The equivalent to "dlocate" for files that might not yet be installed is
"apt-file" - see 

apt-cache show apt-file

Is one more recent than the other?  Or is this another way of Linux being all about choice?

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