Upgrade from Beta 4 to Beta 5 failed with Circle/slash

Same problem with my MacBook Pro (2013), had to restart in Recovery Mode and restore a previous local snapshot.

I also filled a bug report (rdar://42807895) for this issue. Let's hope they fix this with the next beta.

The third machine I have worked fine... it is a standard MacBook Air < 1 year old... The machines with the error are a MACMINI late 2012 and a MACBOOK Pro Mid-2012 with replaced boot drives... The machines have SSDs 1TB & 512G respectively.

I also left a bug report...

42810577

Thanks

I have a mid 2012 MacBook Pro with the same problem. Very frustrating!

I would try downloading the full installer and using that.

The problem is that the recovery is an all day effort... I still have not heard back from APPLE on the bug report... The third machine was a un-upgraded machine. The machines having errors both have upgraded memory ( 16G ) and large SSDs 1TB & 512G...

Was yours with upgrade HD for Boot - SSD with APFS in use already?

Interesting. My MacBook Pro also has a replaced 1TB SSD (the previous 1TB SSD failed and got exchanged in an Apple Store).

Was a straight update from Beta 4 to 5, internal SSD (aftermarket one I installed around 12 months ago), with APFS in use yes.

Beta 6 came out today, not game to try updating to it yet!

I had to find another Mac lying around, log it in and register it with a public beta profile, get beta 4, and then 'install Mojave' from a boot USB drive (miraculously it seems to have not lost anything). It would appear as though my time machine had been broken since June 10. Fortunately it has at least now done a full backup overnight.

Beta 6 seems to have corrected the problem... Both machines upgraded from beta 4 to beta 6 without issue.

I have not heard back from Apple on this but Beta 6 installed correctly as an upgrade to beta 4...

I could update from beta 4 to beta 6, too. But only after I disabled the firmware password (again).