Cannot do-release-upgrade, I'm getting error in Python

[pilatinum]

I'm using Ubuntu server 18.04.2 for ARMv7
But update from ubuntu serfver 16 to 18.04.2 stuck.
I tried to execute commend: do-release-upgrade

But I'm getting this error:

https://i.imgur.com/3Uyb1k5.png

Please tell me how I could solve it.

[Frogs Hair]

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