Is there anyone who has done the in-place upgrade from byzantium to crimson on the Librem 5 who can tell me what the actual size of the download is? (Doco says allow 8 GB disk space free but that doesn’t explicitly say how much needs to be downloaded, approximately.)
According to the output that I saved:
1352 upgraded, 368 newly installed, 14 to remove and 0 not upgraded.
Need to get 1,024 MB/1,025 MB of archives.
After this operation, 1,444 MB of additional disk space will be used.
Is that what you’re looking for?
I can post the full remove/upgrade/download/install output here if you want.
(I imagine I might have had various packages previously installed on my system that you don’t. 
I don’t know if that had an effect on my download from the new repos… included packages, etc.)
I performed the upgrade over ssh, if that’s relevant here.
And I don’t know if the package list has changed since I upgraded in early December 2025.
P.S. I did not use the new PureOS Upgrade package.
Yes. Thanks.
Yes, it will. I wasn’t after an exact number - because it will vary from user to user. I was just after a ballpark number so that I know whether I should leave the download running overnight or hang around for it to finish or somewhere in between.
Almost certainly things will have changed since then but hopefully not markedly.
To upgrade to Crimson, must I do everything,on this page Reflashing PureOS - Purism user documentation
or I only have to push on the button « upgrade to pureos 11 »??
Are you talking about Librem 5? If so, no, you don’t have to reflash. Reflashing is used when you want to wipe absolutely everything out and start again. If you just want to “push a button” then read this post: PureOS Crimson is released!!! and specifically
Existing Byzantium devices will automatically receive a PureOS Upgrade tool soon when installing system updates. New devices will begin shipping with PureOS Crimson pre-installed.
Byzantium users wishing to use this tool today can run:
sudo apt install pureos-upgrade
So, based on that, “push a button” would mean that you can’t quite do it yet, but “soon”.
But if you do want to upgrade right now before the “button” arrives, do this:
… and the upgrade app will be installed, from which you can “push the button” to upgrade now.
You can also find it in the PureOS Store. I found it by searching “pureos upgr”.
The upgrade app should even be automatically installed with updates on byzantium since yesterday.
Thanks! Should I back up my data first? (Is there a risk of losing data when I install Crimson?)
In my case, the button has already been installed for two days (on my L14 and Liberty Phone).
It’s always a good idea to make a backup (and the upgrader reminds you about it as well) even if we don’t expect you to actually need to use that backup, since you can end up being that one person who discovers some breaking issue with the upgrade process
Impossible to upgrade to Crimson. The L14 say : “No foreign pakage. Unknown package versions:
gcc-7-base (7.5.0-5)” What can I do?
I read a similar report here: PureOS Crimson is released!!! - #8 by tudza :
I just looked up “how you uninstall dis?” and got the correct answer, given it worked.
sudo apt-get –purge remove gcc-7-base
( that’s two dashes before the purge, in this window it looks like one long dash is why I mention this )
No idea how it got installed in the first place.
By putting the command between back ticks (`, the key below Esc on my keyboard) it will be correctly formatted:
sudo apt-get --purge remove gcc-7-base
gcc-7-base used to be present in PureOS 9 (amber). Usually such packages would have been removed automatically once they’re made redundant, but apparently it didn’t happen in your cases.
Thanks for mentioning that. Good to know someone who knew what they were doing put it in on purpose. I thought I’d just installed something weird ages ago.