I am unable to copy or paste in other local disk in Ubuntu 18.04 LTS.
I have tried
sudo chmod -Rf 777 /media/atanu/Study where study is my local disk name. It is showing permission issues.
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Looks like the destination device has been mounted without write permissions. In such case chmods won't help you much, until your device will have
Use mount to check what flag it has while mounted:
sudo mount | grep "/media"
you should see something like this:
/dev/sdaX on /media/atanu type ext4 (ro,relatime)
/dev/sdaX to your device name.
ro this means it's read-only.
Umount the device and try to mount it with
rw flag instead:
umount /media/atanu mount -o rw /dev/sdaX /media/atanu
Pendrive's or SD Cards sometimes has physical switches, that makes them read-only. You may need to switch them be able to write on them.