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Failed to mount folders in Linux guest. This is usually because the "vboxsf" file system is not available.

Failed to mount folders in Linux guest. This is usually because the "vboxsf" file system is not available. Please verify that the guest additions are properly installed in the guest and can work properly. The command attempted was:

mount -t vboxsf -o uid=id -u treehouse,gid=getent group treehouse | cut -d: -f3 home_treehouse_projects /home/treehouse/projects mount -t vboxsf -o uid=id -u treehouse,gid=id -g treehouse home_treehouse_projects /home/treehouse/projects

The error output from the last command was:

stdin: is not a tty /sbin/mount.vboxsf: mounting failed with the error: No such device