I've just seen this issue after upgrading from 16.04 to 18.04. Burning DVDs worked but burning CDs didn't.
I worked around it via https://askubuntu.com/questions/1032903/problem-with-k3b-in-18-04-releases-cdrecord-has-no-permission-to-open-the-devi/1034927 with a
sudo chmod 4711 /usr/bin/wodim; sudo chmod 4711 /usr/bin/cdrdao
That did the trick and now allows me to also burn CDs.
I've just seen this issue after upgrading from 16.04 to 18.04. Burning DVDs worked but burning CDs didn't.
I worked around it via https:/ /askubuntu. com/questions/ 1032903/ problem- with-k3b- in-18-04- releases- cdrecord- has-no- permission- to-open- the-devi/ 1034927 with a
sudo chmod 4711 /usr/bin/wodim; sudo chmod 4711 /usr/bin/cdrdao
That did the trick and now allows me to also burn CDs.