This is fixed in Remmina 1.2, FWIW:
$ sudo snap install remmina
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SSH connection never completes, hogs CPU
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: remmina (Ubuntu)
Status: New => Confirmed
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Please let me know if I can do anything else to help debug.
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SSH connection never completes, hogs CPU
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** Attachment added: "gdb.txt"
https://bugs.launchpad.net/ubuntu/+source/remmina/+bug/1641176/+attachment/4776012/+files/gdb.txt
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Title:
SSH
** Attachment added: "sshd.log"
https://bugs.launchpad.net/ubuntu/+source/remmina/+bug/1641176/+attachment/4776011/+files/sshd.log
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