Eu tenho tentado instalar ghdl e gtkwave , mas não consegui até agora.
Aqui está o que tenho recebido:
sudo apt-get install ghdl
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package ghdl is not available, but is referred to by another package. This may mean that the package is missing,has been obsoleted, or
is only available from another source