Hi Skia, thanks for the report!
Confirmed — the upgrade story is broken when transitioning from pre-
versioned rustc (provided by the rustc source package) to versioned
rustc (provided by rust-defaults).
Currently, this is only possible when upgrading from Noble to Plucky or
Noble to Resolute.
==============
24.04 to 25.04
==============
root@rust-upgrade:~# lsb_release -d
No LSB modules are available.
Description: Ubuntu 24.04.3 LTS
root@rust-upgrade:~# apt update && apt upgrade -y
[...]
root@rust-upgrade:~# apt install -y rustc
[...]
root@rust-upgrade:~# ls -l /usr/share | grep rustc
drwxr-xr-x 3 root root 4096 Nov 14 16:54 rustc
root@rust-upgrade:~# sed -i 's/Prompt=lts/Prompt=normal/g'
/etc/update-manager/release-upgrades
root@rust-upgrade:~# do-release-upgrade
[...]
root@rust-upgrade:~# lsb_release -d
Description: Ubuntu 25.04
root@rust-upgrade:~# ls -l /usr/share | grep rustc
drwxr-xr-x 2 root root 4096 Nov 14 16:59 rustc
drwxr-xr-x 3 root root 4096 Nov 14 16:59 rustc-1.84
root@rust-upgrade:~# ls -Ll /usr/share/rustc
total 0
==============
24.04 to devel
==============
root@rust-upgrade-lts:~# lsb_release -d
No LSB modules are available.
Description: Ubuntu 24.04.3 LTS
root@rust-upgrade-lts:~# apt update && apt upgrade -y
[...]
root@rust-upgrade-lts:~# apt install -y rustc
[...]
root@rust-upgrade-lts:~# ls -l /usr/share | grep rustc
drwxr-xr-x 3 root root 4096 Nov 14 17:07 rustc
root@rust-upgrade-lts:~# do-release-upgrade -d
[...]
root@rust-upgrade-lts:~# lsb_release -d
Description: Ubuntu Resolute Raccoon (development branch)
root@rust-upgrade-lts:~# ls -l /usr/share | grep rustc
drwxr-xr-x 2 root root 4096 Nov 14 17:14 rustc
drwxr-xr-x 3 root root 4096 Nov 14 17:14 rustc-1.88
root@rust-upgrade-lts:~# ls -Ll /usr/share/rustc
total 0
===================================================
Expected contents of /usr/share/rustc after upgrade
===================================================
root@expected:~# lsb_release -d
Description: Ubuntu Resolute Raccoon (development branch)
root@expected:~# apt update && apt upgrade -y
[...]
root@expected:~# apt install rustc -y
[...]
root@expected:~# ls -Ll /usr/share/rustc
total 8
-rw-r--r-- 1 root root 684 Aug 22 22:42 architecture.mk
drwxr-xr-x 2 root root 4096 Nov 14 17:09 bin
** Changed in: rustc (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2130706
Title:
/usr/share/rustc change from directory to symlink
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