The reason was that Electrum did not show which fee amount it has set. So switching to manually setting fee size solved it.
More here: https://github.com/spesmilo/electrum/issues/3246

Worth mentioning for everyone who uses Electrum.

Hi!
This is my situation:
- I made a new wallet in Electrum wallet;
- Exported xpub address and generate few sub-addresses;
- Accepted funds on those addresses;
- I can see confirmed incoming transactions in Electrum, as well as total Balance, shows a correct amount.

The problem is that when I click "send" and try to transfer accumulated funds somewhere else it says "Not enough funds".  

How can solve the problem and send my funds?

--
The reason was that Electrum did not show which fee amount it has set. So switching to manually setting fee size solved it.
More here: https://github.com/spesmilo/electrum/issues/3246

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