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How to use zram ?

I have found no howto for zram under debian,  nor even the word "zram" in the archives of this list !

I have tried to use zramctl but it refuses with :

root@nous:~# zramctl --find --size 1024M
zramctl: no free zram device found

I suppose I should init something somewere, but what ?

On the contrary ubuntu has a dedicated zram-config to make the job.

Thanks for any help.