If you want to setup a dedicated you don't currently need more than a dual core. Java isn't multithreaded so you won't see performance gains beyond 2 cores (1 for os, 1 for minecraft).
Ram requirements anywhere from 512mb to 4gb or more depending on how many people you're running and what type of plugins your using. The more plugins, the more ram you will need.
Are you expecting 10 people on at a time? If so, your major limiter will be your net speed most likely. If not, minecraft doesn't need much to run normally.
Giving out your IP is a lot like giving out your address and your phone number.
Most the time you can trust people with it, but if you aren't careful, some stranger with bad motives could come rob you. Or, he could randomly find you and rob you.
Ubuntu, default install, actually has a fairly heft window manger/US. Some like Unity, some hate it. However, with minor tweaking you can switch window managers.
Ubuntu is great to start on, very friendly package management system, easy to pick up basic tasks ( think browse net for help).
Run the desktop version if you plan to be using this computer for your desktop as well. Only difference is desktop version will have Xorg by default (GUI framework) with a windows manager you can use right off the bat.
You can only run 64 bit if you have a 64 bit processor. 64 bit isn't faster, however, it allows more data per clock instruction to be sent through, however, it allows for much larger usage of ram.
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It will run fine as long as you don't throw a lot at it. Dual booting for that purpose you'll find it will annoy you more than anything,
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You can offload other processes onto the other cores in order to dedicate more cycles to Minecraft.
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Ram requirements anywhere from 512mb to 4gb or more depending on how many people you're running and what type of plugins your using. The more plugins, the more ram you will need.
Are you expecting 10 people on at a time? If so, your major limiter will be your net speed most likely. If not, minecraft doesn't need much to run normally.
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If you're on a Mac it may be a permissions issues, what port are you trying to use?
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Most the time you can trust people with it, but if you aren't careful, some stranger with bad motives could come rob you. Or, he could randomly find you and rob you.
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Hard to say if others can join and he's the only one who can't.
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Ubuntu, default install, actually has a fairly heft window manger/US. Some like Unity, some hate it. However, with minor tweaking you can switch window managers.
Ubuntu is great to start on, very friendly package management system, easy to pick up basic tasks ( think browse net for help).
Run the desktop version if you plan to be using this computer for your desktop as well. Only difference is desktop version will have Xorg by default (GUI framework) with a windows manager you can use right off the bat.
You can only run 64 bit if you have a 64 bit processor. 64 bit isn't faster, however, it allows more data per clock instruction to be sent through, however, it allows for much larger usage of ram.