If you want to use apt (or dselect, synaptic or whatever) you need to add the following entries to /etc/apt/sources.list :
deb http://apt.jenslody.de/ any dbg
deb-src http://apt.jenslody.de/ any dbg
and remove entries for the normal nightlies.
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When we do this, (removing nightly's classic lines and adding dbg ones instead) the package 'jens-lody-debian-keyring' become unavailable.
As same, in the dbg repo, codeblocks-additional is broken, because it depends on 'codeblocks' 'codeblocks-additional-common' and 'libwxsmithlib0' at version 10.05dbg6959-1 and only the 'codeblocks-additional-common' is available in this version.
I guess additional-common are not uptodate.
Anyway, for the keyring's problem, you can just accept with potential problems of corrupted archives, or keep "old" lines of classic nightly, but in this case, the system will want to update to the standard at each update. That's a bit annoying.
The solution I've found, is to keep both entries in sources.list, and add some lines in the "/etc/apt/preferences" file.
This result in having those pieces of text in preferences and sources.list:
Package: *
Pin: release o=Jens Lody,c=dbg
Pin-Priority: 900
deb http://apt.jenslody.de/ any dbg
deb-src http://apt.jenslody.de/ any dbg
deb http://apt.jenslody.de/ any main
deb-src http://apt.jenslody.de/ any main
And if you want switch back to classic nightly, just replace the "c=dbg" entry by "c=main".