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Question: No mounted file system

When I am trying to install the GNS3. It is giving me an error i.e.. No mounted file system. I have tried every possible way which is given here but still not able to resolve it.

1) I have tried the /System/Library/Extensions/LexarFilterScheme.kext but the files not there.

2) I have also tried the Disk utility but still the issue is not resolved.

Please provide a good solution for this. I need this to fixed ASAP.

MacBook, macOS Sierra (10.12.6)

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User profile for user: ys7

Question: No mounted file system