First, it would help to get a stack trace. Open a terminal and run gimp --stack-trace-mode always, try to "save as" and copy here the lines you get in the terminal.
Second, look through the comments on the bug I have mentioned. Maybe a suggestion from there might fix your problem.
Hi,
This might be a duplicate of https:/ /bugs.launchpad .net/ubuntu/ +source/ gimp/+bug/ 912909 .
Could you try a couple of things?
First, it would help to get a stack trace. Open a terminal and run gimp --stack-trace-mode always, try to "save as" and copy here the lines you get in the terminal.
Second, look through the comments on the bug I have mentioned. Maybe a suggestion from there might fix your problem.
Thanks.