If ddrescue is not installed then start with installing the GNU ddrescue program.
On Ubuntu you need to enable the Universe Software Repository.
sudo apt-get install gddrescue
Make sure you specify the source disk first and then the target disk.
The -v option enables the progress of the operation to be shown on the screen.
sudo ddrescue -v /dev/sda /dev/sdb
Depending on the size of your source drive this operation could take a lot of hours.
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