[PATCH container 1/2] setup: ubuntu: get version from os-release

[Stoiko Ivanov <s.ivanov@proxmox.com>]

ubuntu 26.10 does not ship /etc/lsb-release anymore, breaking setting
up a container with this version.

using /etc/lsb-release was added in 2015, and has not been touched
since:
 a8e58e9 ("add support for Ubuntu 15.04")

as /etc/os-release has the information we need in all supported
releases (checked by installing a Ubuntu 17.04 container), just use
that and drop the special treatment here.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
---
 src/PVE/LXC/Setup/Ubuntu.pm | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/src/PVE/LXC/Setup/Ubuntu.pm b/src/PVE/LXC/Setup/Ubuntu.pm
index e4b8c1e..374678f 100644
--- a/src/PVE/LXC/Setup/Ubuntu.pm
+++ b/src/PVE/LXC/Setup/Ubuntu.pm
@@ -45,15 +45,7 @@ my $known_versions = {
 sub new {
     my ($class, $conf, $rootdir, $os_release, $log_warn) = @_;
 
-    my $lsb_fn = "$rootdir/etc/lsb-release";
-    my $lsbinfo = PVE::Tools::file_get_contents($lsb_fn);
-
-    die "got unknown DISTRIB_ID\n" if $lsbinfo !~ m/^DISTRIB_ID=Ubuntu$/mi;
-
-    my $version;
-    if ($lsbinfo =~ m/^DISTRIB_RELEASE=(\d+\.\d+)$/mi) {
-        $version = $1;
-    }
+    my $version = $os_release->{VERSION_ID};
 
     die "unable to read version info\n" if !defined($version);
 
-- 
2.47.3