We just upgraded a server from Etch to Lenny and stumbled upon the same problem with Cacti and RRDtool. For us it was sufficient to set
-> Console -> Configuration -> Settings -> RRDTool Utility Version -> 1.2.x First we thought that downgrading rrdtool to Etch's version 1.2.15 would be necessary but fortunately it wasn't. The versions here are on Lenny: ii cacti 0.8.7b-2.1 ii rrdtool 1.3.1-4 </2ยข> We'd have wished though that apt-listchanges had informed us of the need to upgrade the database schema and to set the RRDtool version to 1.2.x.
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