I'm trying to boot Ubuntu 18.10 into Lenovo y530 which already contains Windows 10. I found a similar question Unable to install Ubuntu on Lenovo Legion y530 and I followed this link Installing Ubuntu 18.xx on the Legion Y530.
I followed Ubuntu steps but when I arrived to installation step and I have to choose partition, the only choice I have is /dev/sdb
which is mounted by the USB. I think that windows or there is something that block the installation to access to the disk in order to choose a mount point.
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I'm used to install Ubuntu in other machines and I have the choice between erasing the existent OS or adding Ubuntu with Windows. But today I don't get these choices. In windows I have 3 partitions in my hard disk: C:/, D:/ and E:/ How can I fix this issue?