I am trying to run a new site and am receiving this error message (see the image below).
Do I need to install any additional packages? Is it a missing configuration file? Is Debian 10 (Buster) not supported yet?
Thank you for your help!
Hi, I have exactly the same problem on the same OS,
I’m still looking but for the moment I can’t find any solution. 
getcap and setcap are used to allow the Nginx version that’s bundled with Local to bind on ports 80 and 443.
You can either:
A. Install libcap2-bin using Apt (https://unix.stackexchange.com/a/455234 for more details)
B. Upgrade to Local 5.1 or newer and change the Router mode to localhost under Preferences » Advanced. This will disable the routing layer thus negating the need to bind on ports 80 and 443.
Note: at the time of writing Local 5.1 is still in beta so you will need to join the Local Beta program to get access.
In the meantime, I’ve added a note to look into adding libcap2-bin as a dependency in the .deb's we provide.
The package “libcap2-bin” was already installed on my end.
I tried installing both Local Beta 5.1.1 and 5.2.0, but both versions return the following error message: “Trace/breakpoint trap”.
Is there an argument that I can add to the “local-beta” command to get a more detailed error message?
Got it!
Are you able to open other Electron-based applications such as VS Code?
I’m seeing reports of certain security utilities such as Firejail keeping Electron-based applications from opening.
Other Electron-based applications seem to work; I have Visual Studio Code and Slack running as we speak.
strace ./local-beta might uncover some worthwhile details.
Is your Debian installation 32-bit or 64-bit?
My Debian installation is 64-bit.
Here’s the part of the trace logs which I believe may help you:
readlink("/proc/self/exe", “/opt/Local Beta/local-beta”, 4096) = 26
access("/opt/Local Beta/chrome-sandbox", F_OK) = 0
getresuid([1000], [1000], [1000]) = 0
getresgid([1000], [1000], [1000]) = 0
clone(child_stack=0x7ffe7730b780, flags=CLONE_NEWUSER|SIGCHLD) = -1 EPERM (Operation not permitted)
lstat("/opt", {st_mode=S_IFDIR|0755, st_size=4096, …}) = 0
lstat("/opt/Local Beta", {st_mode=S_IFDIR|0755, st_size=4096, …}) = 0
lstat("/opt/Local Beta/local-beta", {st_mode=S_IFREG|0755, st_size=115346640, …}) = 0
socketpair(AF_UNIX, SOCK_SEQPACKET, 0, [10, 11]) = 0
setsockopt(10, SOL_SOCKET, SO_PASSCRED, [1], 4) = 0
access("/opt/Local Beta/chrome-sandbox", F_OK) = 0
stat("/opt/Local Beta/chrome-sandbox", {st_mode=S_IFREG|S_ISUID|0755, st_size=5581136, …}) = 0
access("/opt/Local Beta/chrome-sandbox", X_OK) = 0
pipe([12, 13]) = 0
close(13) = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f2ae2ef8810) = 7094
rt_sigprocmask(SIG_SETMASK, [], ~[KILL STOP RTMIN RT_1], 8) = 0
close(12) = 0
close(11) = 0
recvmsg(10, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=13}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 0
— SIGTRAP {si_signo=SIGTRAP, si_code=SI_KERNEL} —
+++ killed by SIGTRAP +++
Trace/breakpoint trap
Thanks!
@42Glider ran into a similar issue regarding chrome-sandbox and posted what helped out here: Local doesn't open on Debian
I added the “kernel.unprivileged_userns_clone=1” line to /etc/sysctl.conf, rebooted and now, not only does Local open, but I’m able to run local sites!
Thank you so much for your help!
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Glad to hear it! Thanks for working with me.
Also, shoutout to @42Glider for posting the two potential solutions 
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