This appears to be hitting me as well with a Canon Ixus 310HS (interestingly, I had this same model before with no issues, then had to replace it and now I do). Reported here: https://bugs.launchpad.net/ubuntu/+source/shotwell/+bug/1096463
Please let me know if any log files or similar would assist. On 12.10 I get the lock error, on 12.04 it seems to hang on import after a few files in Shotwell.
This appears to be hitting me as well with a Canon Ixus 310HS (interestingly, I had this same model before with no issues, then had to replace it and now I do). Reported here: /bugs.launchpad .net/ubuntu/ +source/ shotwell/ +bug/1096463
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Please let me know if any log files or similar would assist. On 12.10 I get the lock error, on 12.04 it seems to hang on import after a few files in Shotwell.