There was a failure connecting to the mirror of the Ubuntu archive which
you use, from VarLogDistupgradeMainLog.txt:

2019-08-12 22:15:08,781 DEBUG examining: 'deb 
http://ru.archive.ubuntu.com/ubuntu/ bionic main restricted'
2019-08-12 22:15:08,782 DEBUG verifySourcesListEntry: deb 
http://ru.archive.ubuntu.com/ubuntu/ disco main restricted
2019-08-12 22:15:08,782 DEBUG url_downloadable: 
http://ru.archive.ubuntu.com/ubuntu//dists/disco/Release
2019-08-12 22:15:08,783 DEBUG s='http' n='ru.archive.ubuntu.com' 
p='/ubuntu//dists/disco/Release' q='' f=''
2019-08-12 22:15:18,812 DEBUG error from httplib: '<urlopen error [Errno -3] 
Temporary failure in name resolution>'
2019-08-12 22:15:18,813 DEBUG entry '# deb http://ru.archive.ubuntu.com/ubuntu/ 
bionic main restricted' was disabled (no Release file)

This is an issue you'll need to resolve with your network or workaround
by switching mirrors of the Ubuntu archive.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1839876

Title:
  update to 19.04 crash. because something happen with 'ubuntu-minimal'

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