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....loc, package) : Tcl/Tk support is not available on this system Error: package 'tcltk' could not be loaded Execution halted ERROR: execution of package source for 'debug' failed ** Removing '/usr/local/lib/R/library/debug' The downloaded packages are in /tmp/RtmpEocXcC/downloaded_packages Warning message: installation of package 'debug' had non-zero exit status in: install.packages("debug") Where am I going wrong? Thanks, Jack. --------------------------------- [[alternative HTML version deleted]]