小编Mik*_*sta的帖子

我工作了很多，但我不确定一切是否正常。

nvidia-smi
Sun May 21 11:29:57 2017       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 375.39                 Driver Version: 375.39                    |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GT 730      Off  | 0000:01:00.0     N/A |                  N/A |
| 40%   39C    P8    N/A /  N/A |    295MiB /  1984MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage …

我的朋友给了我一个带有一些 ISO 格式教程的 USB 当我尝试在我的 Ubuntu 18.04 上打开它们时，我得到了这个

如果我选择开始恢复，它是否会清除我 500GB 磁盘上的所有其他内容？

我不知道它是怎么来的，但我的日历（右上角）是波兰语。这个怎么改成英文？

/var/log 文件有什么用？当我尝试在 Ubuntu 16.04 上运行 cassandra 时

OpenJDK 64-Bit Server VM warning: Cannot open file /var/log/cassandra/gc.log due to Permission denied

之后

19:47:58,887 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[SYSTEMLOG] - Active log file name: /var/log/cassandra/system.log
19:47:58,887 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[SYSTEMLOG] - File property is set to [/var/log/cassandra/system.log]
19:47:58,889 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[SYSTEMLOG] - openFile(/var/log/cassandra/system.log,true) call failed. java.io.FileNotFoundException: /var/log/cassandra/system.log (Permission denied)
    at java.io.FileNotFoundException: /var/log/cassandra/system.log (Permission denied)

为什么我会有这些问题？这是我的java

java -version
openjdk version "1.8.0_151"
OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-0ubuntu0.16.04.2-b12)
OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)

这些是权限

/var/log$ …

NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT

    lsblk
        sda      8:0    0 931,5G  0 disk 
        ??sda1   8:1    0   100M  0 part 
        ??sda2   8:2    0 150,3G  0 part 
        ??sda3   8:3    0 558,5G  0 part 
        ??sda4   8:4    0     1K  0 part 
        ??sda5   8:5    0 220,7G  0 part /
        ??sda6   8:6    0     2G  0 part [SWAP]
        sdb      8:16   1   7,5G  0 disk 
        ??sdb1   8:17   1   7,5G  0 part 
        sr0     11:0    1  1024M  0 rom 

当我尝试

 mount /dev/sdb /mnt
mount: wrong fs type, bad option, …

我在 Ubuntu 14.04 上使用 Google Chrome，我对这些一直弹出的日志和 Facebook 通知有问题。我已经设置了内容设置，不允许任何站点显示通知。我接下来应该尝试什么？

I have added

echo "deb http://www.apache.org/dist/cassandra/debian 311x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list

Now I want to remove it and install Cassandra in another way.How to delete it?