I opened private conversation to resolve this issue.I tried to perform the migration today 5 times. Every time it was not sucessfull. At about 40% of download it displayed "System error" or similar message. After the last trial I found the following on the connected USB memory. This was a 16 GB SD card in USB reader/writer formatted to FAT32. I pressed"Home" → "System" → "Migrate to Linux OS" to migrate. Is there other method to perform the migration?