Ubuntu 17.10 will be available to download again from January 11, 2018.
Canonical pulled Ubuntu 17.10 downloads from the official Ubuntu website last month following reports that the release could leave some laptops unable to boot.
Lenovo laptops were among those most affected by the ‘bug’, though reports were also filed by users of devices from other computer vendors, including Acer and Dell.
The bug could corrupt the BIOS of an affected laptop, leaving the user unable to save settings or make changes. In extreme cases the bug left users unable to boot their laptop at all.
I am glad to see Ubuntu notice the issue and remove the ISO fix the issue and release it again very good response.