High Sierra install fail loop
I tried to upgrade my MacBook Pro mid-2012 (500Gb HDD) from Sierra to High Sierra. Downloaded the update painlessly, however the installation process hangs at around 43min remaining and fails with a « Installation failed (DiskManagement error 0) »
If I click on the Restart button, the whole process starts over and the installation fails at the exact same point.
I already ran disk repair on my main macOS partition but to no avail (Repair said the partition was fine)
I have a 2 weeks old backup but not currently with me so I can’t restore anything at the moment.
Disk utility recognises the main partition and even allows me to mount it. I did have a second Linux partition but I cleared it thinking this was the issue but Nope, same problem occurs with or without the Linux partition.
What am I supposed to do to get out of this loop? At this point, I would be happy if I could at worst get back to the previous OS.
Thanks in advance.