06-29-2019
Thanks for sharing this.
If you know where the crontab file is located - usually under /var/spool/cron/, in your case /mnt/var/spool/cron/ - then you can directly edit it. (That method is not good on a live system because the running cron daemon would not be notified.)
Furthermore, a chroot /mnt crontab -e might work.
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