I'm Sam. Thank you for your time and useful responses.
I have recently change my VirtualBox and qiime2 version (6.0.8 and 2019.7) for deepen some previous analyses done with an old qiime2 version (2018.11). However I don't succeed to import my data anymore (Casava Fastq demultiplexed ). It seems that the environment is corrupt or there is a incompatibility within conda version and the machine.
I have already tried to download new VM and QIIME2 and testing different versions but the error always appeared (libgcc or libstdc+). I've tried to update conda but I don't know what to do anymore ?