Actually wifi was on when I tried sending my MMS. I was not aware of that limitation, so that might be the root cause. I have sent other MMS to the same contact since and they work fine. Probably the issue can be marked solved, I do not know how to do that / who can do that
@ChromiumOS-Guy, many thanks for all the advice on package managers and restrictions on using apt-get. I am glad I posted my issue on the forum, I am learning a lot of interesting stuff. Thanks a lot everybody 
@lduboeuf
I installed the devices a week ago (a fairphone 5) from the linux ubports-installer_0.11.2_linux_x86_64.appimage. I picked the stable channel
I have not installed anything manually since that (with an apt-get I mean)
I just used the AppStore to install a few apps
The contents of my /etc/lsb-release indicate:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=24.04
DISTRIB_CODENAME=noble
DISTRIB_DESCRIPTION="Ubuntu 24.04.4 LTS"
In the settings UI, it says
Update channel:
24-04-1.x/arm64/android9plus/stable
Os version:
24-04-1.3
Many thanks for the suggestions & help
Actually, when I got the problem, at first I tried removing the whole conversation. Then, I tried sending another SMS to the same contact, which re-created a new conversation, but that SMS got stuck too (spinning wheel), which made me think there was some service lomiri-messaging relied on that was somehow stuck, maybe ofono (pure conjecture on my behalf).
Following your sugestion (a few hours later), I tried to delete the blocked message, then again the whole conversation, and then sent another SMS to the same contact and this time, it worked. So AFAIK, problem solved, but I do not know why.
I tried to look at the traces by doing a journalctl | grep lomiri-messaging > somefile.txt but I got 2MB worth of traces. I tried to grep -i 'error' or 'invalid' but I do not know exactly what to look for. Lines which appear suspicious to me (but may be completely unrelated) are:
juin 02 14:38:27 ubuntu-phablet lomiri-messaging-app[95339]: QSocketNotifier: Invalid socket 19 and type 'Read', disabling...
...
juin 04 17:58:56 ubuntu-phablet lomiri-messaging-app[16850]: file:///usr/share/lomiri-messaging-app//MessagesListView.qml:87: TypeError: Cannot read property 'left' of null
...
juin 04 12:05:42 ubuntu-phablet lomiri-messaging-app[11099]: error calling result "An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.103" (uid=32011 pid=11099 comm="lomiri-messaging-app message:+XXXXXXX" label="lomiri-messaging-app (enforce)") interface="com.lomiri.libertine.Service.OperationsMonitor" member="result" error name="(unset)" requested_reply="0" destination="com.lomiri.libertine.Service" (uid=32011 pid=4480 comm="/usr/bin/python3 /usr/bin/libertined" label="unconfined")"
juin 04 12:05:42 ubuntu-phablet lomiri-messaging-app[11099]: lastError - no arguments?
...
No sure this is much help. I will experiment again with MMS and post back on this thread if find something useful
Hello,
I am having a problem with the lomiri messaging app (Ubuntu 24.04.4 LTS / lomiri-messaging-app 2.0.1+0~20250905202428.1+ubports24.04.1~1.gbp83639a) on a fairphone 5. SMS work fine, but
I tried sending a MMS with 4 pictures to a contact. The message did not go through (wheel icon spinning indefinitely). Now all subsequent SMS to the same contact also display the wheel icon spinning indefinitely (the pipepline in clogged). Other SMS to other contacts work fine.
How can I reset the pipeline / cache or whatever data is stuck so that I can resume sending regular SMS to my contact ?
Many thanks
Lukas