Bug#853858: /usr/bin/apt-key: cannot add gpg keys due to their large size

Thank you. It is hard to search "Singed-By:" option on the forums. I solved the problem in Synaptic Package Manager by menu -> Setting -> Repository -> Authentication -> Import Key File. I guess it imports the keys into /etc/apt/trusted.gpg. Using "Signed-By:" option seems better

Bug#853851: Re: Bug#853851: gimp: cannot start gimp on stretch due to llvm error

I removed 'beignet-opencl-icd' and gimp works fine. Thank you.