Cannot connect to printer Canon Pixma MG5300 by network

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I can print with this printer just by plugging it with USB, but there is no way to do it with its Wireless mode.

The printer works. No doubt. I can network print from Windows, and responds to ping.

I used system-config-printer, because seems like the other tools are buggy.

I connect to the printer through LPR (I checked that this is enabled in it) with the URL lpd://192.168.1.18/PASSTHRU, but when I print something it fails with:

W [27/Oct/2012:18:01:20 +0200] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'Canon-PIXMA-MG5300-Gray..' already exists
W [27/Oct/2012:18:01:20 +0200] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'Canon-PIXMA-MG5300-RGB..' already exists
W [27/Oct/2012:18:01:20 +0200] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Canon-PIXMA-MG5300' already exists
W [27/Oct/2012:18:01:20 +0200] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'Canon-PIXMA-MG5300-Gray..' already exists
W [27/Oct/2012:18:01:20 +0200] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'Canon-PIXMA-MG5300-RGB..' already exists
W [27/Oct/2012:18:01:20 +0200] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Canon-PIXMA-MG5300' already exists
E [27/Oct/2012:18:01:39 +0200] [Job 39] Job aborted due to backend errors; please consult the error_log file for details.
D [27/Oct/2012:18:01:39 +0200] [Job 39] The following messages were recorded from 06:01:39 PM to 06:01:39 PM
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6852
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6853
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6854
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6855
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6856
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6857
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6858
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6859
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6860
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6861
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6862
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6863
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6864
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6865
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6866
D [27/Oct/2012:18:01:39 +0200] [Job 39] Gutenprint: Reading 14874 6867
D [27/Oct/2012:18:01:39 +0200] [Job 39] Read 4096 bytes of print data...
D [27/Oct/2012:18:01:39 +0200] [Job 39 ...