Stuck in downgrading to 1.2.1


I have been stuck for one week in downgrading to 1.2.1, I tried with meteor downgrade --release 1.2.1 or meteor create app --release 1.2.1 or meteor update.... I deleted and reinstalled Meteor…
My download stops at max 30% then no data download.
Is there a problem on the server ?
Is there an other solution to this issue ? I am on Ubuntu.

I tried everything proposed on the forum and anywhere else, it is desperate. My app is almost finished. :disappointed:

Thank you for any help