Web Reference: Jan 16, 2026 · However, a common roadblock arises when using minicom (a terminal emulator) on the host: the error minicom: cannot open /dev/modem: No such file or directory. This blog post will demystify this error, walk you through its root causes, and provide a step-by-step guide to resolve it. Oct 14, 2020 · What minicom tells you with this message that it has tried to open a interface called /dev/modem. It is telling you, that it can't be opened due to insufficient permissions. When inserting the USB GSM modem Huawei K3565, the network manager recognizes it and I'm able to activate it from the network manager. But when run in minicom it says: minicom: cannot open /dev/mod...
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