When trying to install GRASS 7.x, on opening the unzipped dmg image, I receive the following message:
The following disk images could not be opened
image: grass-7.4.0.dmg
reason: no mountable file systems
Though results for GRASS 7.4 are shown, the problem occurs with all three GRASS 7. disk images on the grassmac site.
The files were downloaded using both Safari (twice) and then Chrome (once) under OS 10.11.6 (El Capitan) w/o success via the Finder.
I then tried running the UNIX clean-up utilities
Then I tried a second reboot
all to no avail.
I was able to mount the disk image using terminal:
$ hdiutil attach -noverify -nomount ./GRASS-7.4.0.dmg
$ diskutil mountDisk /dev/disk2
however…
the newly mounted image was empty. Disk Utility could 'see' the mounted device, and was able to run First Aid, which yielded the following:
'Problems were found with the partition map which might prevent booting'
but couldn't fix the read-only dmg. Everything else, according to Disk First Aid, seemed okay.
I note that these most recent images were not tested under OSXs earlier than Sierra (10.12). Perhaps this [my running El Capitan 10.11] is the problem?
Any suggestions/help [to get GRASS installed] would be greatly appreciated.
Thanks very much, in advance.
Paul