The manpages are in the tcl8.5-doc
and tk8.5-doc
packages. This is the usual convention on Debian-based systems, Ubuntu included, that the documentation packages has the same name as their base packages, plus the -doc
suffix, and developer packages use the -dev
suffix.
Also note that Tcl and Tk, as packaged for Debian (and pulled by Ubuntu), have virtual packages, which are provided by physical packages matching the default version of Tcl and Tk in a given distribution. These packages are tcl
, tk
, tcl-doc
and tcl-dev
. You can install them and be sure the next distro upgrade will pull in the next default versions of Tcl and Tk, when it's time. Currently the default version is 8.5 but it supposedly will be 8.6 in a year or so.
For the future, you are perfectly able to answer questions like this all by yourself using the package searching site — navigate to the "Search the contents of packages" block towards the end of the page, enter lappend
into the input box, select i386
or amd64
as your architecture and tick the "packages that contain files whose names contain the keyword" option, then click the search button.