Looks like you don't have the right permissions on the files in /usr/share/wakeup. Could you list your output of `ls -l`? Are you running based on your manual install or by installing the .deb?
Well, it looks from your output that the general user does not have read access to the directories in /usr/share/wakeup/ (plugin_scripts, plugin_settings, default_plugin_confs). On my system the general user does have access:
drwxr-xr-x 10 root root 4096 Mar 6 08:29 default_plugin_confs
drwxr-xr-x 11 root root 4096 Mar 6 08:29 plugin_scripts
drwxr-xr-x 2 root root 4096 Mar 6 08:29 plugin_settings
That is why I asked about the manual vs deb install - since you mentioned in your bug report that you tried installing wakeup from the .deb and by manually copying over the files from the .tar.gz. My guess is that you did the manual version second, and that not all the permissions worked out right. Try adding read permission for all users to the folders in /usr/share/wakeup (i.e., plugin_scripts, plugin_settings, and default_plugin_confs)
Thank you. I can now understand why Wakeup didn't start... and it's starting since then. But now, I cannot stop itany more! It freezes when I click on the [stop] button and the terminal says nothing useful
can you provide the terminal output from running `wakeup-settings`?