After a recent system upgrade, Gimp started to work again. I am not exactly sure about what made it work again.
Gimp-gap was upgraded, but I do not think it is related to this bug. Aptitude suggested to remove some packages, among which were libopenblas-dev:i386 (0.1alpha2.2-3) and libopenblas-base:i386 (0.1alpha2.2-3). I cannot do deeper testing because these packages are only in “unstable” and these versions are not available anymore. The current versions have stricter dependencies and conflict with other BLAS implementations. So I think, the bug was a dependency error (conflict) between several BLAS packages that I had, but was not actually related to Gimp. I still do not know why it seemed to affect only Gimp, but I think this bug report can safely be closed now. Thank you.
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