The solution (provided by Wolfgang Walter) is:
ln -s /usr/lib/chromium/chromium-sandbox /usr/lib/chromium/chrome-sandbox
as root.
Edited: See dibl's post below.
Excellent -- thank you.
FYI, (for copiers and pasters) there is no space between "chromium-sand" and "box". ;)
Thanks dibl. My apologies. I'll correct the original post just in case anyone doesn't read any further into the topic.
Thanks a lot!
You've saved me an important waste of time.
today the fixed chromium hit sid. Please post if the "fixed" chromium update properly. Thanks.
Today? I do have a chromium with chrome-sandbox instead of chromium-sandbox since longer. And I didn't rename the file or symlinked anything. And yes, today's chromium update installed and runs fine.