Reproduce the initial issue:
```
$ sudo arc_summary
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/sbin/arc_summary", line 986, in <module>
main()
File "/usr/sbin/arc_summary", line 937, in main
kstats = get_kstats()
File "/usr/sbin/arc_summary", line 431, in get_kstats
result[section] = load_kstats(section)
File "/usr/sbin/arc_summary", line 142, in load_kstats
with open(path) as f:
FileNotFoundError: [Errno 2] No such file or directory:
'/proc/spl/kstat/zfs/vdev_cache_stats'
Original exception was:
Traceback (most recent call last):
File "/usr/sbin/arc_summary", line 986, in <module>
main()
File "/usr/sbin/arc_summary", line 937, in main
kstats = get_kstats()
File "/usr/sbin/arc_summary", line 431, in get_kstats
result[section] = load_kstats(section)
File "/usr/sbin/arc_summary", line 142, in load_kstats
with open(path) as f:
FileNotFoundError: [Errno 2] No such file or directory:
'/proc/spl/kstat/zfs/vdev_cache_stats'
```
Pull update from `jammy-proposed`:
```
The following packages will be upgraded:
libnvpair3linux (2.1.5-1ubuntu6~22.04.5 => 2.1.5-1ubuntu6~22.04.6)
libuutil3linux (2.1.5-1ubuntu6~22.04.5 => 2.1.5-1ubuntu6~22.04.6)
libzfs4linux (2.1.5-1ubuntu6~22.04.5 => 2.1.5-1ubuntu6~22.04.6)
libzpool5linux (2.1.5-1ubuntu6~22.04.5 => 2.1.5-1ubuntu6~22.04.6)
zfsutils-linux (2.1.5-1ubuntu6~22.04.5 => 2.1.5-1ubuntu6~22.04.6)
5 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.
Need to get 2,189 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
```
And it now works:
```
$ sudo arc_summary
------------------------------------------------------------------------
ZFS Subsystem Report Thu Jul 03 13:07:14 2025
Linux 6.8.0-60-generic 2.2.2-0ubuntu9.2
Machine: jupiter (x86_64) 2.2.2-0ubuntu9.2
ARC status: HEALTHY
Memory throttle count: 0
ARC size (current): 89.4 % 3.4 GiB
...
```
Thanks so I can confirm the verification-done-jammy tag :)
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https://bugs.launchpad.net/bugs/1980848
Title:
arc_summary doesn't work with HWE kernel
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