-[1] Please notice that lenny is the current old-stable release within Debian.
-grml-debootstrap can handle the release but you really should not use lenny
-anymore unless you really know what you are doing. Choose stable (squeeze)
-instead.
+[1] Please notice that lenny and squeeze are unsupported releases within Debian nowadays.
+grml-debootstrap can handle the releases but you really should not use them
+anymore unless you really know what you are doing. Choose the current Debian
+stable version instead.
+
+Notice that you need to specify a mirror providing the lenny/squeeze releases, the
+default (http://httpredir.debian.org/debian) doesn't provide it any longer nowadays.
+Set the mirror to e.g. http://archive.debian.org/debian/ if you don't have
+your own lenny/squeeze mirror.
+
+You also need to specify a filesystem that's supported by lenny, e.g.
+'--filesystem ext3' since grml-debootstrap's current default (ext4) isn't
+supported by lenny.
+
+Also when debootstrapping lenny on a live system with a kernel version
+like "3.16-1-grml-amd64" lenny's libc will fail to install with:
+
+ [...]
+ /var/lib/dpkg/tmp.ci/preinst: line 265: [: 3.16-1-grml-amd64: integery expression expected
+ /var/lib/dpkg/tmp.ci/preinst: line 231: 3.16-1-grml-amd64: syntax error: invalid arithemtic operator (error token is ".16-1-grml-amd64")
+ dpkg: error processing /var/cache/apt/archives/libc6_2.7-18lenny7_amd64.deb (--install):
+ [....]
+
+To workaround this either debootstrap from a system with an according
+kernel version or use the "fake uname" workaround (just google for it).