問題情境

使用USB燒錄Ubuntu Server映像檔，安裝過程中因找不到CD-ROM而報錯：

[!!] Detect and mount CD-Rom
Error reading Release file
The CD-Rom does not seem to contain a valid 'Release' file, orthat file could not be read correctly.

You may try to repeat CD-Rom detection but, even if it does succeed the second time, you may experience problems later in the installation.
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一般而言USB安裝Ubuntu應會順利而不至於遇到此問題，個人經驗是如遇到此問題應該OS也會安裝失敗，可以檢查拔除其他Device(如其他USB碟)解決。

解決方法

1. Alt+F2 進入Terminal。

2. 將USB Device掛載到/cdrom

   mount -t vfat /dev/[USB] /cdrom
   

3. Alt+F1 離開Terminal，繼續安裝。

如/cdrom已掛載錯誤的Device就先unmount掉

在Terminal下查詢Devices & Partitions的指令：

cat /proc/partitions