cd ~/users
The squiggle character aka tilde means YOUR own home directory. You want /Users (capital U in case it’s a case-sensitive filesyste). ~/users would be a folder called ‘users’ in your own home directory which doesn’t exist. At least, it’s /Users on my Mac.
A tad unreasonable as this would appear to be a PICNIC error not a software error. TOMs do what they’re told even if it’s death.
Not checking free space is ridiculous. The Catalina update is a pile of crap. It removed support for 32 bit apps. If you depend on any 32 bit apps then **** you, we’re Apple we can do what the hell we like. It broke loads of apps all over the place including Cisco Webex that we use for work. Sure, you could blame the app vendors, but hey, Windows still supports 32 bit apps.
It also broke MS Word (64 bit version!) which caused the whole system to crash several times a day, until I rolled back to an earlier version.