targetcli exists only in wheezy + experimental nowadays.
Quoting the package description of targetcli-fb:
| The targetcli-fb package is a fork of the "targetcli" code
| written by RisingTide Systems. The "-fb" differentiates between
| the original and this version. Please ensure to use either all
| "fb" versions of the targetcli components -- targetcli, rtslib,
| and configshell, or stick with all non-fb versions, since they
| are no longer strictly compatible.
# iscsi (target) support
libiscsi-bin
open-iscsi
-targetcli python-urwid
+targetcli-fb
tgt
# ata-over-ethernet