I don't know exactly why this error occurs. Look at Bug#872500.
20.08.2017 15:31, Mr.Mei пишет:
Package qtbase-abi-5-7-1 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'qtbase-abi-5-7-1' has no installation candidate
