New answers tagged synaptic
I had the same problem with some orphaned files, created after using rsync. A few hidden files starting .f were created on my external hard drive. Even a sudo rm would not remove them. Unmounting the drive, then re-mounting it allowed me to rename then delete the files. If the orphaned files are on a system hard drive, I'd say boot into a live CD then ...
You can look to /var/log/apt/history.log and see what has been removed. Then just re-install what is missing. I would suggest to start with sudo apt-get install --reinstall ubuntu-desktop This may be enough.
It seems you are supposed to prepend gmt commands with GMT: GMT minmax file.txt
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