Packages from Debian missing in Ubuntu

[Михаил Новоселов, Думалогия]

Hello Ubuntu developers,

Why are some packages, which are available in allDebian releases, 
including Debian Sid, are not included in Ubuntu 18.04? Examples of 
packages: phatch (was available in all previous Ubuntu releases), 
electrum, bitcoin-qt

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С уважением,
Михаил Новоселов, технический специалист школы "Думалогия"
думалогия.рф | mikhailnov at dumalogiya.ru