Comment 19 for bug 1360200

Kovid, sorry did not notice you working on the detach issue. I tried those commands and it launched fine. See the command and command line output below. Same issue for me, if I use --detach it fails.

bpeckin@Midenheim:~$ calibre-debug -c "from calibre.gui2 import detach_gui; detach_gui(); from calibre.gui2.main import main; main()"
Starting up...
libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
Started up in 1.10 seconds with 652 books
bpeckin@Midenheim:~$ calibre-debug -c "import os; os.fork() != 0 and sys.exit(0); os.setsid(); from calibre.gui2.main import main; main()"
bpeckin@Midenheim:~$ Starting up...
libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
Started up in 1.11 seconds with 652 books