> install.packages("vcd")
Installing package into ‘/home/leo/R/x86_64-pc-linux-gnu-library/3.2’
(as ‘lib’ is unspecified)
--- Please select a CRAN mirror for use in this session ---
Error: .onLoad failed in loadNamespace() for 'tcltk', details:
  call: dyn.load(file, DLLpath = DLLpath, ...)
  error: unable to load shared object '/usr/lib/R/library/tcltk/libs/tcltk.so':
  libtcl8.6.so: cannot open shared object file: No such file or directory

另外已经安装过tcl包了。
谢谢啦！