Unable to store host key: open("/home/<myuser>/.putty/sshhostkeys.tmp") returned 'Permission denied'

[Albert.net]

Hi. I am using Filezilla 3.41.2 under Ubuntu - VERSION="18.04.5 LTS (Bionic Beaver)"
Since few days, when I connect to a new machine, I receive the message

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Unable to store host key: open("/home/<myuser>/.putty/sshhostkeys.tmp") returned 'Permission denied'

All the path to the "sshhostkeys.tmp" file has read and write permissions.
Any idea how I can debug and fix this problem ?
Thanks
PD.- tried to go to 3.51 but ...

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./filezilla: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by ./filezilla)

[botg]

Please check the permissions again.