How to read sd card from Kubuntu (Linux) PC

I have an Arduino Yun running on my LAN(wifi). The card has an SD card mounted.
How best can I read the content of the card from a Kubuntu(Linux) PC?
I've tried:-
sshpass -p 'xxxxxx scp root@192.168.1.138:/mnt/sda1/datalog.txt /home/bill/Downloads/yundata.txt
but get error
'nable to negotiate with 192.168.1.138 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1'

The Yun and sd card were in use some years ago. The card is formatted and holds data

Any advice welcome

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