I have a laptop with 4 GB RAM and CPU Intel i5 520-M it's a x64 bits processor in the specification. Is Ubuntu 15.10 amd64 ISO image compatible for this CPU, or only i386? Because the system starts quite slow. Help me until I install all software I need.
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Yes, Ubuntu is fully compatible with x86_64 CPUs.
Ubuntu probably boots slowly due to the HDD's I/O speed.
Could you run a read benchmark from the included Disks application?
You'reAGitForNotUsingGit
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I receved this message when I tried to do the test. "Error unmounting /dev/sda1: Command-line `umount "/dev/sda1"' exited with non-zero exit status 32: umount: /: target is busy (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1).) (udisks-error-quark, 14)" System boots slower but seems to work stable. – Piotrek May 17 '16 at 16:10
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When I unclicked the average speed read is 62,4 MB/s (100 samples) – Piotrek May 17 '16 at 16:27