Bug#192439: Hit this as well
I hit this problem as well. To be precise, whereas "apt-get update"
succeeds (or seems to), "dselect update" fails with:
Merging Available information
E: Internal Error, Unable to parse a package record
update available list script returned error exit status 100.
Press <enter> to continue.
This is current sid, with latest dpkg and apt. Even with sid as only
source lines the error shows:
deb ftp://ftp.debian.org/debian sid main contrib non-free
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