The GNU C library (packaged as libc6 in Debian) is the bedrock of a lot of code. What are the packages that it depends on? (Yo, DebGraph!)
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libc6 is one of the well-connected vertices in the lower-left corner (third quadrant, if you like). For graphs like this one, we would like DebGraph to identify dependency cycles (loops). For example, libc6 depends on libgcc1, which in turn depends on libc6. This can be seen in the graph above by applying some careful scrutiny, but why not let the computer work its magic for us? (To be continued.)
As a bonus, who depends on arping 2.05-2 for i386?