21 February 2010
KDE 4.4.0 on Kubuntu Karmic 9.10 -- a note of warning
I just upgraded my Kubuntu 9.10 "Karmic Koala" from KDE 4.3.4 to 4.4.0 using the backports repository. A note of warning: take a backup.
It took me something like 4 or 5 runs of apt-get dist-upgrade / apt-get -f install to get back a working setup. APT complained about a couple of things (python-qt3-doc conflicting with some newer package which includes the same examples, and Bilbo having been renamed Blogilo) but eventually pulled it through.
I was smart enough to backup the .kde home directory before launching a 4.4 session, and I'm glad I was. First run: Plasma crashed hard on a segfault, and didn't restart. Ok, this happened with some past upgrade already, let's just move away the old .kde home... got back a default desktop. Playing around with widgets, I hit another crash. And another. The culprit was always the Plasma Desktop, actual applications were running fine. Eventually, I moved back the old .kde home except the plasma* files under .kde/share/config/. This gave me back all my old KDE settings, except for Plasma. Win, I thought, and merrily set out to recreate my previous desktop arrangement.
Another crash.
So uhm. I'll try to track down what exactly Plasma doesn't like in my setup (which was, for the record, with two panels on left and right edge; Lancelot and a couple of QuickAccess widgets on the left, task manager and shutdown button on the right; two Plasma "views" and 4 virtual desktops), but if you are planning a similar upgrade, make sure you put aside some time for it, and get a good backup beforehand.
(I guess the question now would be "is it worth it?". Well, KDE does look more polished, applications are faster to launch and more responsive... it does look like we're finally at the point where one could upgrade from a 3.5.x release to 4.x and feel a bit awestruck.)
Labels: GeekDiary, kde, kubuntu
posted by GiacomoL @ 11:56 PM
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09 February 2010
Mobile applications for Nokia phones with... javascript ?!?
A few days ago the lovely folks at NSManchester, an Apple user group, gave a chance to "the enemy" (i.e. Nokia) to present their technology stack and business strategies for attracting developers.
The two presenter were a bit underwhelming (understandable after they went through the usual, hellish experience with British railway services), and there was little talk of my beloved Maemo, but it's hard to dismiss the technology stack they have chosen to go forward. Key element seems to be the QT library they acquired last year, which I know and love through the original Python bindings. It's powerful and as cross-platform as it can be, with a lot of mindshare in the Linux and Windows communities; this said, it's still C++, and it's hard to get excited about C++ these days. Also, the runtime will gradually appear on new and recent phones but probably won't make it to older ones.
The second development platform they are pushing, however, was more of a surprise to me. Apparently, you can use JavaScript to write applications for recent smartphones (S60 5th ed. -- N97 and 5800 -- and S60 3rd ed. FP2 -- e.g. E72, N85, N96 etc). You can access GPS coordinates, contacts and calendar items, as well as having complete freedom to design the UI with standard HTML and CSS. You don't need to sign the resulting packages, the barrier to entry is lowered dramatically. This is potentially a game-changer, and I don't know why Nokia are not shouting it from the rooftops. Early adopters include Netflix, which uses a basic JavaScript interface to stream their Flash content (!) -- so yes, you can use flash as well. My head simply went "boom"; I must look into this stuff.
One other thing I noticed was the presenters' style, typically European: self-deprecation and brutal honesty about things that work and ones that don't. It was refreshing, after weeks of Yanks propaganda from Google and Apple pushing their new gadgets as "fantastic", "amazing", "revolutionary" etc etc etc...
Labels: GeekDiary, javascript, maemo, Nokia, PyQt, Qt, S60
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