アップグレードに失敗する不具合
「clang-6.0」と「pocl-opencl-icd」がインストールされている「Ubuntu 18.04 LTS」で「Ubuntu 20.04 LTS」へアップグレードしようとすると、アップグレードに失敗する不具合が報告されています。
不具合の内容
不具合の詳細は、以下を参照してください。この不具合に影響を受けた場合、以下のメッセージが出力されます。
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This was caused by:
* Upgrading to a pre-release version of Ubuntu
This is most likely a transient problem,
please try again later.
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.
An unresolvable problem occurred while calculating the upgrade.
This was caused by:
* Upgrading to a pre-release version of Ubuntu
This is most likely a transient problem,
please try again later.
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.
回避策
以下のいずれかのパッケージを削除してから、アップグレードを実行します。- clang-6.0
- libomp5
リリースノートに反映
本件は「Ubuntu 20.04 LTS」のリリースノートに反映されています。For Ubuntu 18.04 systems with clang-6.0 and pocl-opencl-icd it is not possible for the release upgrader to calculate the upgrade to Ubuntu 20.04. (bug 1886748) It is possible to workaround this by removing clang-6.0 or libomp5 and then upgrading.
